Please don't take this the wrong way, but could the guilt feelings be a part of the mental health issues?

I don't know what mental health issues you struggle with, but telling yourself that your issues aren't "big enough" or that you "should be able to just snap your fingers and fix yourself" are self-shaming messages, and they sound like part of a depression or other similar mental health problems. It's important to see that even though you feel guilty over having no control, that doesn't mean you ARE guilty of having no control. In fact, having no control absolves you of any guilt. But the guilt is incredible effective at keeping you in a place where you put yourself down and possibly give up.

I say these things because it's exactly how depression has worked for me. Depression fooled me into feeling guilty for my own depression. By posing those "why don't I" questions to myself, it took all focus away from actually battling and confronting the depression. Thus it only made my depression worse.

I hope you find this useful.