Are we all egoists?

Hey fellow readers. I'm awake nearly 2 days again, slightly drunk and somehow a little bit hungry... Time for a new post!

Recently I had a conversation where I was told I should care more about myself and stop trying to be that nice to everybody else. This got me thinking since I knew even though I really do (nearly) anything I'm asked for and always try to make the people around me more happy I'm just doing it for myself to feel better, aren't I?

Actually I don't have a solution to the the topic but I'll try to explain it nontheless.
Everytime you give a gift to someone didn't you do it to make the other person happy so you enjoy yourself delightened by the other persons happyness? I hope you know this feeling since how would it be like if this feeling wasn't there? Would you still do it?

It's said there there are two ways of beeing nice. Being nice the "normal way" and being nice in a "manipulative way" to gain a favor from the other person. So isn't the "normal way" of being nice a self-manipulation?  And since manipulation is often a bad thing is the "normal way" bad too? Is there another way?

I think you get the point by now and actually I'm too lazy to continue from here or break my head trying to think over a solution.

tl;dr: Everything we do, we do for ourselfes. Regardless of how noble our motives are.

Did you have any thoughts or experiences about this thesis? If so please share it with me.

And stay awake ;)