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Happy Birthday OP. Wish I could say things will get better, but I don't know you, so I can't.
What I will say is that you can do a few small things to mitigate your loneliness. I would advise exercising regularly (If you are in better shape, it is easier to love yourself and easier to draw others to you). I would also say find a hobby that takes you out of the house and forces you to meet people. When I was 18 and lonely, I played a lot of Magic the Gathering. It was painfully nerdy, but it got me out of my room and into the broader world.
