friendships are hard

Recently I've come to the realization that I'm going to get hurt in a lot of relationships because of just how much I care about other people. And how I expect that others will care about me just that much in return. Except that it's not possible for a lot of people to care as much as I do. So I end up hurt.
I don't open up to people very readily. If I've opened up to you, you're special and I care a lot about you. I want to be your friend forever. Or at least for a very long time. I would do pretty much anything for you at this point. Once we've reached this point, I'm not going anywhere. But, in return, I expect to be cared for, too. That's only fair.
But sometimes, that's just expecting the impossible. Not everyone cares as much or in the same way I do. I've said this to myself several times a day lately. Not everyone cares as much or in the same way I do. I don't know why this is so hard for me to get this through my head. Not everyone cares as much or in the same way I do. And that should be okay. I should lower my expectations. I should appreciate what I have. But I can't.
I have had some very, very good friends. I still have some very, very good friends. But it hurts a lot when I feel like I've done everything I can for a friend and then I get ignored. Then I have no one to lean on.
I'm probably just being overly dramatic. I probably just need to get over myself. I keep getting hurt and that's probably my fault. So, either I must change, or I need to accept that I will get hurt.
See, the thing is, I can't stop caring about people. And I don't want to. I don't want to stop forming deep, close friendships. I don't want to stop loving. But I am going to have to find a way to figure out how I'm going to cope when I feel unappreciated. Because this isn't really working for me.