Java heap space

I run out of allocated memory and cannot change the max amount of memory allocated. I don't know what to do and I need help. I tried changing the -Xmx2G to -Xmx6G and it doesn't give me more memory.

Here's the crash log:

---- Minecraft Crash Report ----

WARNING: coremods are present:
  ObfuscatePlugin (obfuscate-0.4.2-1.12.2.jar)
Contact their authors BEFORE contacting forge

// Hi. I'm Minecraft, and I'm a crashaholic.

Time: 5/22/20 2:23 PM
Description: Initializing game

java.lang.OutOfMemoryError: Java heap space

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Thread: Client thread
Stacktrace:
    at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:383)

-- Initialization --
Details:
Stacktrace:
    at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:383)
    at net.minecraft.client.main.Main.main(SourceFile:123)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
    at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

-- System Details --
Details:
    Minecraft Version: 1.12.2
    Operating System: Windows 10 (amd64) version 10.0
    Java Version: 1.8.0_51, Oracle Corporation
    Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
    Memory: 258871456 bytes (246 MB) / 536870912 bytes (512 MB) up to 536870912 bytes (512 MB)
    JVM Flags: 9 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx7G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M -Xmx512M
    IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
    FML: MCP 9.42 Powered by Forge 14.23.5.2830 Optifine OptiFine_1.12.2_HD_U_E3 14 mods loaded, 14 mods active
    States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored

    | State | ID            | Version           | Source                           | Signature                                |
    |:----- |:------------- |:----------------- |:-------------------------------- |:---------------------------------------- |
    | LCH   | minecraft     | 1.12.2            | minecraft.jar                    | None                                     |
    | LCH   | mcp           | 9.42              | minecraft.jar                    | None                                     |
    | LCH   | FML           | 8.0.99.99         | forge-1.12.2-14.23.5.2830.jar    | e37.4 F3d122 F44.6 F986df165.2 F1193 F0ac98351565.8 F90a557 |
    | LCH   | forge         | 14.23.5.2830      | forge-1.12.2-14.23.5.2830.jar    | e37.4 F3d122 F44.6 F986df165.2 F1193 F0ac98351565.8 F90a557 |
    | LCH   | obfuscate     | 0.4.2             | minecraft.jar                    | None                                     |
    | LCH   | bbs_mod       | ${version}        | bbs_mod-1.12.2-1.4.358.jar       | None                                     |
    | LCH   | cfm           | 6.3.1             | furniture-6.3.1-1.12.2.jar       | None                                     |
    | LCH   | ironchest     | 1.12.2-7.0.67.844 | ironchest-1.12.2-7.0.72.847.jar  | None                                     |
    | LCH   | jei           | 4.15.0.291        | jei_1.12.2-4.15.0.291.jar        | None                                     |
    | LCH   | journeymap    | 1.12.2-5.7.1      | journeymap-1.12.2-5.7.1.jar      | None                                     |
    | LCH   | mantle        | 1.12-1.3.3.55     | Mantle-1.12-1.3.3.55.jar         | None                                     |
    | LCH   | tconstruct    | 1.12.2-2.13.0.183 | TConstruct-1.12.2-2.13.0.183.jar | None                                     |
    | LCH   | torohealthmod | 1.12.2-11         | torohealth-1.12.2-11.jar         | None                                     |
    | LCH   | vehicle       | 0.43.5            | vehicle-mod-0.43.5-1.12.2.jar    | None                                     |

    Loaded coremods (and transformers): 
ObfuscatePlugin (obfuscate-0.4.2-1.12.2.jar)
  com.mrcrayfish.obfuscate.asm.ObfuscateTransformer
    GL info: ' Vendor: 'NVIDIA Corporation' Version: '4.6.0 NVIDIA 442.59' Renderer: 'GeForce GTX 1070/PCIe/SSE2'
    Pulsar/tconstruct loaded Pulses: 
        - TinkerCommons (Enabled/Forced)
        - TinkerWorld (Enabled/Not Forced)
        - TinkerTools (Enabled/Not Forced)
        - TinkerHarvestTools (Enabled/Forced)
        - TinkerMeleeWeapons (Enabled/Forced)
        - TinkerRangedWeapons (Enabled/Forced)
        - TinkerModifiers (Enabled/Forced)
        - TinkerSmeltery (Enabled/Not Forced)
        - TinkerGadgets (Enabled/Not Forced)
        - TinkerOredict (Enabled/Forced)
        - TinkerIntegration (Enabled/Forced)
        - TinkerFluids (Enabled/Forced)
        - TinkerMaterials (Enabled/Forced)
        - TinkerModelRegister (Enabled/Forced)

    Launched Version: 1.12.2-forge1.12.2-14.23.5.2830
    LWJGL: 2.9.4
    OpenGL: GeForce GTX 1070/PCIe/SSE2 GL version 4.6.0 NVIDIA 442.59, NVIDIA Corporation
    GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

    Using VBOs: Yes
    Is Modded: Definitely; Client brand changed to 'fml,forge'
    Type: Client (map_client.txt)
    Resource Packs: 
    Current Language: English (US)
    Profiler Position: N/A (disabled)
    CPU: 12x Intel(R) Core(TM) i7-8700 CPU @ 3.20GHz