I'm pretending I'm fine alone and it's making things worse.
Why are you pretending to be fine?
I feel it's best the hide the fact that I'm lonely, but in reality it makes me feel worse.
That sounds like depression - I have it, too, so I understand. It's okay to reach out for help for these things. Have you thought about therapy?
I have too many problems and I can't do that. I'm lonely as fuck here.
Mental health is something that should be taken very seriously. Again, I sympathize with what you're going through because I also go through it. Making the first step to seeking help is going to make you feel so much better, trust me.