Have fun Lena, date as much as you can, go to lots of parties, talk and hang out with everyone and most importantly, keep smiling....Deborah is right in saying; they will be the best days of your life.
I hung out with everyone, didn't get tied down with one girl so I dated a lot (my advice to you also), played football, baseball, smoked lots of weed, went to parties....maybe I smiled cos I smoked lots of weed but anyway, just smile!