You don't include the font/ in the ResourceLocation.
Mojang put Fonts in resource packs so people can mod vanilla.
I suggest you search the internet for ttf font resource packs and compare your config with theirs.
You should also check the logs/debug.log for errors/warnings during resource pack loading.
Finally, if you just post snippets (or worse describe your code in English) you aren't going to get much help.
Put your code on github where we can see everything in context so we can confirm you did it correctly and maybe try it for ourselves if the problem isn't obvious from just reading the code.