Some guidance?

I'm 21 and struggle alot with security and mental stability realistically I've been independent in caring for myself since I was an early teen. I struggle alot emotionally to be independent and am easily influenced and pressured by surrounding relationships I have with relatives. I know it's a long shot to request but I've been reading self help books lately and they've helped but does anyone know of one to help with becoming a stable adult mentally, financially and so on in the important things?