That in general life!the nicer person you try to be the more you always seem ending up feeling down or really bad?

I mean i always try and be nice to people,try and make them feel good about themselves again and general stuff,and yet i always seem to end up feeling like a titand feel poo!Dont get me wrong i aint perfect,can be a tit and be ott!even tho i dont mean to be!but i never seem to learn and always seem to get sucked in!

Why?

And yes today has not been a good day