I don't usually get sick

So within the past 6 months I have been sick, all the time. I am 21 years old, and the last time I remember being sick with anything more than the regular cold or flu, I was 9 and had strep. Over the past 6 months I have had a yeast infection (first ever), then two weeks later a UTI (again a first), due to the antibiotics I was put on, I got another yeast infection. I then had an allergic reaction to latex, which I have never had a problem with before. About a month and a half ago I had an ovarian cyst rupture (yet again a first) and a few weeks ago I came down with the flu, which I ended up getting bronchitis from.

My main concern is that I have never really been sick before for more than a few days. Is this something I should be concerned with? Could there possibly be some underlying something that is causing all these problems?