In the kindest way
Hey me, I wanted to say this with love:
You will never be good at guitar, singing, programming, league, or the other things you worry about also. You won't be loved like you want, you won't find that perfect soulmate or group of friends you crave. You won't find your BFF when you go talk to that person in class for the first time, nor at the activities you push yourself to do.
Isn't that liberating in the sweetest way? If you can believe that there's no more pressure to succeed or a fear of failure. Go ahead and try that feeling on, it doesn't feel as bad as it looks!
Try to carry that with you when you go push yourself out of your comfort zone and fail as many times as you can. Enjoy it!