I think it's perfectly fine to say "I'm happy where I am, I don't want more".
But that's not the OPs sentiment. I think that deep inside OP feels entitled to higher achievements than they have been able to reach, and are resentful of the fact that life hasn't been unfolding properly for a person of their talent.
To that I say, how long are you going to nurse your ambition without getting up and doing something about it?