I sympathize with this because I have a mental illness but I’m the older person in the relationship, so I always feel I should be the one taking care of the other person. Rather, it’s often my partner that takes care of me, and sometimes I feel inadequate and guilty for it.

But from what you’ve written, it sounds like you’re probably giving something to your partner that you don’t realize. All relationships are a 50/50 give-and-take, and sure, you may not be able to cook dinner, but perhaps you’re an invaluable source of support for your partner’s self-esteem. Perhaps you entertain him or make him laugh. In other words, never sell yourself short!