Sex problems with my fiancee

I’m having sex problems with my fiancee and our sex life. I have tried to talk to her about trying new things in the bedroom but she always wants the same positions every time and makes no attempt to help spice things up. We have been together for five years and she has always told me she is not comfortable with her body. I do everything possible to assure her that she has nothing to worry about with me, that I love her just the way she is. But there is one thing  she said she would never do— give oral. And she just recently told me that she does not like foreplay and would rather get straight to intercourse, but I can’t do that because I suffer from P.E., so foreplay for me is the best sex I can give her for longer than three minutes and I don’t think that she understands that completely. So my real question is: How do i convince her to give me a little foreplay and try new positions? Any help or advice would be greatly blessed.