Plz read? I am not sure what to do. I'm shy and?

SO yesterday the guy I really like and I hung out yesterday problem is when hes around I go totally silent cause I have nothing to talk about it sucks because im not like that around anyone else we had planned on doing something just the two of us but I hate myself for it cause in my head there is so many things I want to do with him I just dont have the confidence? any tips?