You're very young and it's unlikely that you will marry this person, but if you do - 2 years is nothing! It makes a heck of a lot more difference at the age you are both at now than it does on down the line. I know - my husband is four years younger than me and a I know a bunch of other couples where the woman is a little bit older. We are in our 40's now and it just isn't that big of a difference. When our husbands taunt us with the fact that they are younger than us we just tell them it doesn't matter because we LOOK younger than they do!
My nephew/godson is 22 years old and he is dating a 50 year old woman (his best friend's mother). What's with THAT?!! I suggested he was looking for some mothering... Seriously, I hope he doesn't get burned. It seems to be going on for a year or more now.