I don't want to be pregnant anymore

I am only 23 weeks and I feel terrible. My ribs feel broken and my stomach feels so stretched and cramped that idk how I can grow anymore. I am starting to feel claustrophobic like something is stuck inside of me and the fact that I have to wait a couple more months until it's out makes me feel worse. I get anxious about it and I just feel like the walls are closing in. Has anyone else dealt with this? I'm not even that big yet. I am showing but I know I will only get bigger.