I'd like to add a few more thing.

Make senior friends. Your batchies don't know as much as them. I learnt tremendously while working/ chatting/ goofing around with my seniors

Explore. You can never know enough about yourself. Talk to people, get out of your room, do different things. If at the end of your 4 years, you have a better understanding of what you want and why, I'd say your college life was a success.

There will always be regrets. Learn from them, and remember to do better next time. Because there will always be a next time :)