What makes me trully happy? When I can look myself in the mirror and be proud. And I am not talking about great achievements - it's not. I am proud of myself when I am just the way I want me to be. What I mean by that:
I grow wiser. I don't make the same mistakes over again, I learn from my experience. I have an idea of myself in 10 years and I am really happy, when I can tell myself in the mirror: "You are on your way". Some of the things I wish to achieve in 10 years may never happen, maybe most of them won't - but I know I am doing it, and doing it right! Nothing else makes me sleep better then this feeling of fulfillment. Ever since I taught myself to worry about things that don't concern me, I have became more productive and resourceful person, then I was couple years back.
That thing makes me really happy about myself. It's a change which started this year and is ongoing process but I feel I am on a right track.