Doped monk, for all u unaware with my handle, this is Sandy.
Once there was a Scorpion and a Frog. The scropion asked frog to carry him across the river on his back. Frog "No dude, if I carry u, u will sting me." Scorpion says "If I do that we both will drown." Frog says "uh-huh k." As they are in the middle of river the dumb scorpion stings the frog. While they both were drowning flabbergasted frog asked him "why?????" Scorpion replied "its in my nature."
The incredible thing in these four years is that no one changed. Now, that I see in retrospect you could pretty much guess what will the first-year-you turn into as a fourth-year-you. Achal Bhaiyya never drank or doped despite his constant company of shady creatures like me. I became this get-ready-to-do-whatever idiot which I always knew I would become. Ranjit still works hard, Mohit still keeps reminding people of their utter inability to achieve greatness (not in words but by raising the bar, he is right now eating in Bill Gates' house, that SOB). Geeks remained geeks, Dorks remained dorks, Bakchods remained so. So, AOE might have been replaced by CS, Comics replaced by science fiction, Spielberg replaced by Linklater or Lucky Ali by Porcupine Tree. But these are all just accesories of our lives. They do not define us, they are just something from outer world touching our inner fears, eccentricities and dreams. And this is what indentifies us, sets us apart. Our identities, most precious possesions from our vast array of "things".
Bottom line is we are just the same as we were four years back, the college just showed new horizons and possibilities. What we chose to persue from that huge collection of possibilities is result of our core values not our surroundings. So you should be satisfied with what you are into because YOU chose it.
One corollary can be, dont compare yourself with your peers and what they have achieved or other way round because of the desicions they took. Because you might seem to working in parallel lines but trust me you are actually in a completely different universes.