Like those before me have said, if you have to ask "is it right" you should generally assume that it isn't time for you yet. Not only that, he's 18 and pressuring you whether you realize it or not. You are still young. Enjoy your youth. You have the rest of your life for sex and other adult things. Wait until you are old enough to make decisions like that. Trust me, you don't want to end up pregnant or with an STD. Chances are your b/f isn't a virgin at 18. Don't give in to his little ploy to get you into bed. Ultimaltely it is your choice but remember, he is GOING OFF TO COLLEGE. If you get pregnant, he is sure to ignore it. Just listen to your inner voice. Trust your first instinct and if you decide to go through with it, get yourself on birth control and get some condoms.
"We can live like Jack and Sally if we want.
Where you can always find me
And we'll have Halloween on Christmas
And in the night we'll wish this never ends
We'll wish this never ends..."