Should i join this activity since i'm almost done with college?

You sound busy. I would suggest joining a club that is less time intensive. Any club, as long as its active and welcoming should be a good place to develop your social skills and meet new people. There are community service clubs, sports clubs, activity clubs, interest clubs, cultural clubs... Just remember you have to put yourself out there in order to get anything in return. Don't worry about being judged - if you're confident and know what you want (to be friendly & make friends) it should show. I know it takes time, it's a lifelong process but eventually you will become the person you want to be.