From the way you've articulated your situation, you sound a lot older than 18. At the same time however, you seem immature in the ways of a lasting relationship. My instinct is that you're not telling us everything or not being completely truthful about the circumstances. However, in the spirit of helpfulness I'll try to answer your question from two perspectives.
If you are 18: Relax. There will be other girlfriends and other relationships in the years ahead. Don't try to pressure or maniplulate her into doing something that she's already said she isn't ready for.
If you are older: Talk to her. Be honest with how you feel about the situation. Tell her pretty much the same thing you've posted here and let her know that you want more of a physical relationship. On a scale of 1 to 10, you have to decide how important a sexual relationship is to you at this point in your life, and if it's more important than she is. Be ready to make some decisions.
Mojo
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