I’m sick 90% of the time HELP

Y’all this has to STOP. I’m in college and I’m sick legitimately all the time. Last semester I got sick in September and did not get better until December. I went to the doctor, took medicine etc etc but I still keep getting sick. I came back from winter break and it’s only been a week and I’m sick again. I work out, eat pretty healthy, try to get enough sleep so I just don’t know what’s wrong with me. I know it’s college and the close quarters are not helping but man, nobody else gets sick as often as I do. Any tips?