It's not a "mindset" to notice that people only reach out to you when they want something. You notice that they reach out to others who aren't you and don't include you, They reserve you for favors only. If you find out about something and ask to be included they'll say "sure," but it doesn't feel great to feel like you have to beg.

That's not a "mindset," dude.

It's really hard to try to make that relationship more reciprocal and it really sours you on trying to create other relationships. You wonder if there's something inherently wrong with you. If your lot in life is always to be an outsider.

There's also the second type of person one can get caught up with, the narcissist. They think that the world owes them everything and they will take, take, take and never give anything. This one is a typically bit easier to deal with and do a little less damage to your mental health. Though they can sometimes be charismatic, so difficult to spot early if you aren't used to dealing with that type of person. The charismatic ones don't demand anything, especially not right off the bad. They make you feel like it's your choice to do them favors.

It's easier to notice if you have exceptionally "wanty" people in your life. But can happen regardless.

Some relationships are dysfunctional. Some people are toxic. That's not a "mindset" problem. It's clear you're not familiar with dysfunctional relationships, which is great, so don't accuse others of having the wrong "mindset" when you don't know.

I've felt this way for a while, that the give/take in my relationships is imbalanced, and that I'm not receiving what I need.

But then I tried to imagine receiving what I thought I wanted, and whether it would truly make me happy. The answer is almost always no.

The few times the answer was yes, I traced down why within myself, and found that, honestly, I just wanted people to care about me.

Then I realized that they have already shown ways that they care about me, just not the ways I was wanting or expecting, or found as meaningful.

Or I realized that I was not believing that they cared about me, and that it was merely a performance, but that I had no good reason for doubting it, and was just being overly demanding of a sign. (Not always, though. With some people, there were clear signs they were faking it.)

Or I realized that there was no context in which those things could come up, so the genuine love from the other person might actually be present, it's just that there's no opportunity for them to express it, until a scenario is created where it makes sense for them to do so in some way.

And other similar thought experiments within myself. This has led to me (a) realizing that a good number of people do actually care about me to a significant and meaningful degree, and (b) I need to take the initiative more often to create situations where they can express it, even if it's something as simple as asking them to have coffee with me.