You absolutely need to schedule in time for your social life. You will burn out (quickly) otherwise. Make friends in your dorm (one of my dearest friends was in the same dorm as me - we talk every single day and have for many, many years). Try out a ton of different clubs/orgs until you find one (or 2..) with people you like. You can have fun while doing ECs that will look good on your app. Also seek out older students that you think are super cool (in the clubs/student gov/sorority/frat/etc.).
Also, I find it really helpful to have friends in a variety of majors. My non-premed friends keep me SO grounded. They let me vent to them about how much I hate this whole process, and they can vent to me about whatever, but then we MOVE ON and talk about other stuff. A lot of people in the pre-med world will just keep. talking. about. the. friggin. tests. That's not healthy.
Find people that won't drive you crazy and stick with them. If they drive you crazy, don't be friends with them. A lot of people you meet this year may not be your friends as the years go on. That's totally fine! It's normal! By the time you graduate, you'll have friends. Your friends may not be friends, but you'll still have friends! Or, you may have a group where everyone is friends. It all varies. Just get out there, find your tribe, make some mistakes (don't get an IA...), study abroad (DO IT!) and enjoy your time in college. Don't leave after 4 years thinking, wow, if only I had done x...Leave without regrets. Try things out (different classes, whatever).
College isn't always as easy as people make it out to be. People struggle in college - it's hard being thrown into a situation where you're now a little (very little) fish in a VERY big pond. You'll survive and learn a ton about yourself on the way. You got this.
(sorry for rambling...this is just my brain on very little sleep)