Yeah, that's something I've been thinking about myself. I think I have trouble holding it in because I really strongly believe in emotionally supporting the people I care about, but I get resentful if I keep letting people lean on me while feeling like I couldn't ask for the same thing.
I'm trying to make more casual friendships to remove that inequality. People I can just hang out with, but without that emotional expectation that always seems to fall on one person.