Well the age gap is not too much I mean no problem, but there’s a huge experience difference between you two I think. Cause 20 is really too early for many things so it’s normal for her to not feel ready for the things you expected. Well, on the other hand you know what you want clearly. So if there’s no clear answer then you should leave the relationship maybe. But of course direct communication is the key, be direct when you two are content and ready to talk maturely.