I want to quit

1. If you're finding yourself consistently bored during some afternoons, League is something that I think is fine to fill that void. If anything, divide your time into study time and play time. Depending on what subject you're studying, you can allocate 50/50 of your time to studies and games (can adjust as needed). Honestly, quitting League will only marginally encourage you to find something more productive to do, but finding something productive to do is something that you can do regardless of whether you decide to pull the trigger and quit League of Legends cold turkey.
2. If you want to meet women, stay up-to-date on the events happening on your campus. Attend any events that interest you, and with any luck, you'll find another person who you'll share similar interests with and take it from there. Alternatively, you can hit up the local bars if you're of age, but personally, that's not really my style.
3. It's all about priorities. If you want to play sports on Saturday and be active on Sunday, make a schedule. Once you see where you've allocated your time, you can see where your free time is, and subsequently, where you're most likely to want a break and potentially play League of Legends (or Overwatch or DOTA or nap). Not only will this allow you to stay more organised, but it'll also encourage you to do the things you want to do, such as staying active on Sundays.

So, yeah. When I say "why not both?", you could always try ;)