I go to a commuter school, and we have a lot of the same issues as you. For one, greek life goes largely unnoticed. I sought out greek life after transferring here my soph year, but so many people don't realize that we have greek life at all. I think that's changing as the campus atmosphere itself changes because the administration is actively fostering campus involvement from all students.
Make sure your org is doing letter days at least twice a month, if not more often. I'm a senior and I still have people in my classes asking me about greek life like they didnt know it existed. I am more than happy to educate them
I also sympathize with the "bad education" stigma that commuter schools can get... I transferred here from a large, more respected state school and people still give me looks when I tell them where I go, or when I tell old high school classmates that I transferred. Only you will know the true value of your education and your college experience, so put all you have into it and the rest will fall into place!