here is one of the big truths i have learned in life:
when you choose one thing, you un-choose something else
you have to face this as you grow up. you can't do or be everything you every dreamed about. you can do or be a lot of your dreams, but to some extent, you have to pick and choose. it is scary at first, but it's not that bad. it applies to all sorts of situations: premed, marriage, career choices, money...
when you choose the premed path, especially if it doesn't correspond with your major, you give up other opportunities... maybe spending a semester abroad or partying all the time.
when you choose to get married, you give up the fun and ego-stroking that comes from dating new people.
when you choose a high-paying career, you give up the idea of having a lot of leisure time.
when you choose to buy an expensive car, maybe you give up going out to eat as often.
these aren't bad choices, but i think it's important to recognize that they are trade-offs. you have to think about what you are un-choosing when you make big decisions. if you aren't comfortable giving those things up, then you aren't ready to make that decision. the good news is you can always (well, usually) change your mind and choose soemthing else.
i had a really fun time at college. i got good grades, but i also partied a lot. i didn't take all the med school prereqs because there were other classes i really wanted to take and felt i wouldn't have the chance to take again. i was ok with the idea of graduating without knowing exactly what i was going to do with myself.
later, after college, i decided it was really time to pursue my goal of becoming a doctor, so i am making sacrifices now. i declined an offer to work with the world health organization in geneva because while it was a really exciting opportunity and a huge honor to be offered the position, it was not going to move me closer to my goal of becoming an MD. instead i took a boring office job which gave me the money and stability to take the right steps toward applying to med school (studying hard and rocking the mcat, finishing my prereqs, paying for applications). now i go to school at night after work. it's exhausting, and i miss the things i used to do at night (which were FUN, cause my sweetheart works in the music industry and gets free tix and backstage passes to whatever he wants). but i've got my eye on the ball and it's paying off. to me, these sacrifices are worth it. but when i was in college they weren't, so i didn't make them.
sorry this got so long. maybe it doesn't seem like wisdom to you, but this is maybe the single biggest lesson i've learned between college and now. think hard and make sure you are ready for the sacrifices you are making. otherwise they won't be worth it. and don't be afraid to change your mind and choose something else for a while. there is a lot of time in life to choose different things.