Is this healthy?

I'm 18 years old and have problems with my stomach. I always get really insecure about it. I just want to know if my insecurities are true. Sorry if this seems stupid and petty, but this legitimately bothers me daily. I feel like my stomach isn't skinny enough. I feel so stupid for saying it, but its how I feel. Please help me by telling me the truth. I have spondylolisthesis which makes it harder to stay fit and work out. But I try. Some days I just do nothing about it. Please comment. Thank you.