Should Me and boyfriend break up in 3 years when we both go to university ?

Me and My boyfriend have been going out for a while now. We are both 15, he wants to be a lawyer so when he goes to university he'll have to stay for 6 years but i only want to be a graphic designer so i only have to go for 3 years. We are both madly in love regardless of our age but it seems we may not be able to bare the long distant relationship. We want to get married in the future, that's how dedicated we are, is uni a test for marriage or is it just too much?