It's just because I liked it and wanted to do it. Otherwise I'd have given up.
I've learned how to play by ear, that is hear a song and immediately play along. It seems impressive but I have no natural talent for it, it's just built up as I've gradually played and learned. I guess there are a small number of people born with something supernatural, but most professionals have got there through perspiration
Edit: I'm not a professional! That looks misleading