I'm scared

I have a question? When ya'll are in your 20s why do friends and families say ur gonna fall off cause I think what's going on with me for some reason that just don't understand at all at this point. Cause I always feel like I'm active on my social media, can't talk to my friends or anybody at all, and too scared to even speak or show myself on YouTube. Ever since my grandmother passed away last year I felt like my life was stuck for no reason is there answer to why this happening to me?!?!?!? Please