What do you do when people do things you don't like, but it's to hard for you to really explain what it is that upsets you

Sometimes i mention it. It depends the nature of things. On my relationship with the person. Some things I know that things are what they are
So now when things bother me i write things down on a piece of paper. I might rant and rage. But then I burn it.
But for others. I say ..hey you! You've done pissed me off! I ain't happy

I either say it directly or just don't say anything, like withdraw from them

No is a complete sentence 😌

Complain on sw.

That depends on how important it is to me that they know.

Either i avoid them or i tell them off.. or both

Getting out of their sight is the easiest.

I guess it depends what it is but I usually mention it to them