So I'm a 21 year old guy in college. I've been sexually intimate with a good number of girls but what I really want is a meaningful relationship.

I find it hard to progress past anything casual with women because once they really get to know me I worry that they will discover that I have issues with anxiety and think I am not masculine and lose all attraction they have towards me.

Is my perspective here accurate? Anyone else feel similar?
I'd really appreciate it if anyone has suggestions on ways I could open up without making myself feel too vulnerable.