I simultaneously love, and hate, my situation and myself

My thoughts seem to continuously flip-flop between "Yay! I'm me, isn't it great! I understand now!" and "I f**** hate this situation! Three decades of stress that could have been avoided & relationships that could have grown more easily!".

Those thoughts by the way are meant only as illustrations of the types of thoughts that lead to two opposing feelings of a) feeling comfortable in my own skin and optimistic vs b) feeling angry about - I'm not exactly sure what.

I'm fully aware that the "flop" side - negativity, despair, anger, "if only" - is unproductive. But it still arrives in my head.

Anyone else get this?