How do I handle my feelings and needs without venting to my friend too much?

There's a lot of feelings I have and things I need, but I feel like I say way too much in such a short amount of time. I often either say nothing and it hurts, or I tell my friend way too much and it probably gets annoying. I'm not sure what to do or how to handle this. Sorry if this is a bit too vague, I'm bad at phrasing stuff.