You know - they have tons of stuff out there now for that stuff. Try Maderma or something like that. You can go to any Walgreens or CVS and ask the pharmacist what creme they recommend for stretchmarks. You have a pretty common problem, so don't be embarrassed sweetie!
Stretch marks are not a big deal. I have terrible streaks coming from my underarm and running down half my bicep from lifting weights improperly in high school. Don't worry about guys or anyone thinking it's unattractive. If you don't care what anyone thinks and they just bother you in general I can be of no further help. lol