Should I tell people I’m bi?

I’m not sure if it’ll just make things worse or not because I’m currently in a committed relationship of two years. While I am still young (18), I do strongly believe that my boyfriend and I are going to be together long after college. So like best case scenario is it doesn’t change anything and worse case scenario is I might get judged by people and I’m scared of that. I’m not sure if this is a part of me that I need to express to people or if it should just be left unsaid. I am also worried that people will think it’s for attention because I have a boyfriend. I know my boyfriend wouldn’t like leave me or anything but still it’s scary. Idk what to do and I probably won’t tell anyone I know but either way I’m glad to get it off my chest so thanks for reading bye