you're not alone, i have daily fears of going places or joining new groups or teams because i'm afraid and scared and i think that people will not like me and i will not fit in. honestly when i do push myself and do get out of the house, i feel much better being around people. once you get back in the house it is almost as hard as the first time to keep getting out and being social, but you just have to keep pushing yourself to keep going and convince yourself that everything will be alright, and that you will have fun, and after a while, you will feel more comfortable, and things will get better,

Best of luck