Wondering about my sex life Future!!!?

I been wondering if my girl will have as much sex with me when i get older u know after marrige cuz we r still virgins and i honestly cant wait no much longer i been wondering if my girl is going to change her thoughts about sex because right now she doesnt want to know nothing about it!! and i talked to her about it and she got mad at me because she thinks all i think of is sex and no all im concerned about is she being afraid or not wanting to have with me in the future after marrige!! cuz i told her at least twice a week and she said no thats to much????? I would consider me a very active person but shes different! and im afraid shes not going to make love with me very often!!