Here's another thing I thought of: there's really 3 options for how to relate to family members who are unsupportive. #1 - keep trying to be close and receive what you need from them. #2 - cut off communication, or basically just don't bother much with them. #3 - maintain the relationships, but keep your guard up, and don't expect much.

That #3 is probably the most complicated to sustain. It gets used a lot because, often, we have a connection that we're not ready to sever, but we're sick of getting hurt from. I think this is often true with close family relationships - like with parents or siblings. I'm thinking of a sibling of mine who is not a bad person, but has had a knack for saying dismissive things to me when that was the last thing I needed. I stay in touch with her and we get along amiably. But I don't readily confide in her. Maintaining just the right distance from another person so you don't get sucker punched can be challenging.

There's a limit to how much hurt you can take from someone before you have to set up a defence strategy against that hurtfulness. You have every right to do that. I think it takes some experimentation to come up with the optimal plan. You don't have to make yourself available to people who invalidate you. That doesn't always mean you have to give up having anything to do with them. There might be a middle way that works. You don't owe explanation to those kind of people either.