Do dreams really signify something?

I had a dream where I was in the hospital sitting down on a chair. I had stomach surgery on the lower left of my stomach and my doctor was saying that I had a stomach cyst (it doesn’t even exist, I don’t know why that came up in my dream), and my mom was yelling at the doctor because she thought the surgery wasn’t needed. I was scared to look at my own surgery cut, and I didn’t even look at it or touch it. Then my dream shifted. I was in school, changing in the girl’s bathroom. I accidentally put on shorts instead of jeans and went like that for the whole day. I begged my teachers to let me go in the locker room again to change into jeans, but they refused, and yelled at me. I really want to know what this means!