I showered with my mom and things got awkward
Why would a shower with your mom be awkward?
It happened when I was very sick and it was very hot, I got in the shower with her.
Sometimes you'll end up in situations like that where things get a bit confusing, however most people would expect you not to find a shower with your mother as a hot experience. You should try speaking with someone about this so that you can work through it.
It doesn't make sense. So I should feel ashamed of myself?
There's no real reason to feel shamed, but after a certain age if you shower with your parents then society deems it as pretty weird. There aren't a lot of people who would believe that's normal, and they would tell you not to do it again.