What can I say...? In my experience, there is no point in hiding feelings. You devour yourself and you suffer. Of course, one may also suffer after a revelation and an unpleasant reaction. But... then you have done everything humanly possible and have no reason to blame yourself.
Should I propose to her ?
I can't give you any real advice; we don't know each other and I have no idea about your situation. In general, I would advise openness and courage.
Thanks @weisser-rabe.