Are me and my girlfriend going to break up eventually?

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My girlfriend is going to go to California this Summer and that's were she is from and has a ton of friends over there that like to party, and then next year she will be going to college. But we got into an argument/discussion about that she is going to want to go to parties and drink and smoke and live that life. Honestly I don't want her to be doing any of that and especially without me. I understand that if she wants to go to college and live that college life that she can. I wont hold her back but I don't want to be a part of it or her if she is. Am I making the right decision? Will this be a problem in the future? And should I get ready for a break up?