I hate to be the cantankerous old a**hole here (and to even think of myself as "old" actually is quite funny if you've ever met me haha), but the undertone of some posts here seems to be seeing your interests/experiences/values/who you are as a means to an end - that end being "business school" and the "I will be whatever I need to be to get into b-school". As if business school is more important than you - or being willing to see yourself as a "check the boxes" person or being far too willing to shape who you are in order to gain admittance to some holy grail that you see as "business school" that will make you more grown up.
It's sort of like losing your virginity.
When you're still a virgin, you have all these fantastical ideas of what sex is supposed to be like. That all of a sudden, the moment "it happens for the first time" everything about you will change in the most fundamental way possible.
Until it happens. And then in hindsight you realize it's not that big a deal. Sex is fun, it's great, but the moment you had your "first time" isn't going to make you any more of a man where it *really* counts; getting an MBA is kind of like losing your virginity. It's barely a blip, just the very beginnings of hopefully a *very* long life filled with multiple careers of varying success, and multiple roles.
I've seen it time and again with college kids (and to some extent applicants with some experience, but mostly college kids) who are far too willing to see their current lives as purely a means to an end - they're not just planning for the future, but *living* in the future.
By any measure of success, fulfillment, etc. -- how ambitious you are in college has little to do with where you end up long-term.
Life and careers (multiple careers) is a marathon, not a 100-yard dash in college. It's about the body of experience you accumulate over a lifetime. And that takes *sustained* effort and stamina, which has little to do with how hardcore you are in college. It's not some race where you're keeping score vs others (even though it can feel that way especially if you go to an Ivy or other prestigious college alongside other similarly stressed out neurotic students with the weight of the world on their shoulders that are either self-imposed, or imposed by their overbearing parents).
And of course I can sympathize. I (and some other posters here) were once in your position. We were also college students once. We may have even shared the same views as you do when we were in college. We wanted *so* badly to succeed for a variety of reasons - and even for *no* reason, but blind ambition to right the wrongs of the past. You *think* you know yourself, but you really don't know yourself as well as you think, which is why you're far too willing to give up your right to be an *individual* and far too willing to be a "check the boxes" person. It's like being in a huge rush to grow up faster than you should. When someone says "enjoy your time in college" and you get defensive about justifying your ambition, there's probably something going on inside that you may need to deal with sooner or later.
There's nothing wrong with ambition. But if you're far too willing to become whatever it is to fulfill that ambition (i.e. you're willing to sell your soul even if you don't know what that "soul" may be just yet), it's not a healthy kind of ambition.
I'm sure some of you college guys are going to think I'm a condescending pr*ck for saying all this, but if you wanted honesty, you got it. I've seen the narrative and responses to this time and again - how "I'm not like this at all." "I really know what I want, what I'm doing, etc." Which may or may not be true.
But I encourage you college students to write what you think you know at this point in your lives in a little journal, and then lock it up. Or if you posted on this thread - to save it. Come back in 10 years (or even just 2-5 years out of college) and see if you still agree with what you wrote here. The chances of you having a very different perspective than you have now is practically a guarantee. But I guess you'll have to experience and live through it yourself to discover that.
The *real* question isn't whether you *can* get into a top b-school, it's whether you even *should* at this point.
And to the original poster: yes, you should *always* be enjoying your life. ALWAYS. Plan for what you can't see over the horizon, but focus on what is in front of you. Because you never know when your time is up. It's easy for young folks to avoid the issue of mortality altogether because it seems almost inconceivable - until it actually happens (like it did to three of my ex-colleagues in banking, who passed on waaayyy too young).