For years I suffer from repeated (and SEVERE) pneumonia, Strep, Bronchitis, UTI's, and more. WHAT is causing?!?

I'm 30- and I have had everything in the book from Mono, to pneumonia to pleurisy. Literally, whenever I travel- no matter the climate, I get Pneumonia so bad within a couple days I need to be hospitalized. I have also Female reproductive disorders, namingly Endometriosis and Polycystic Ovarian Syndrome. I had strep so often so badly I had to have my tonsils removed at 27. I nearly died of strep 8 times, no joke. Now when I get sick, it goes straight to my lungs instead. I travelled to NYC and had SEVERE pneumonia after walking around the cold city for 3 days. 104 fever 3 nights. On z pak, yet again. Also an inhaler and so forth. I am so fragile, and I don't understand why. I KNOW there has got to be a reason. I don't get "colds" ever- I get near death, in a matter of days. Also, I am being considered for rhumetoid athritis and also fibromyalgia. WHY AM I SO SICK? Please help. I have had these issues my entire life. I don't have HIV, I tested. Please help I cannot live a normal life. Also, now I have weight issues, acne and infertility. makes me not want to even try anymore. I just want to be normal!