Honestly, I have nothing to add to this besides Amen. Amen, amen, amen. For years I have felt inadequate for being average at so many things, instead of great at one thing. I've done illustration, creative writing, copywriting, dancing, programming, strategy for an advertising agency, academic research and writing, website building, PR..and I'm only in my early twenties.
All my life, I have been surrounded by people who have one great skill, people who urged me to "just pick one thing". I can't, my life would feel incomplete. Jobs always feel limited in a way, only being able to do one thing for a long time bores me to tears. I have however -no exceptions- once I was hired always heard "damn, you can do a lot".
I could repeat here exactly what you wrote about friends, about jobs, about needing guidance..but I won't. I just wanted to let you know that I read it and I could've written it myself, had I been able to find the words suitable to express how I feel. And..I'm an Aries too, coincidence?