How come life isnt fkn fair?

My friends have sex ONE TIME and with a condom and got preggo. iv been having unprotected sex for almost 2 years and cant have a baybeh :( i also have a very irregular period, like, il have one then skip a month, then have 2 in the same month. how do i regulate my period so i can find out when i ovulate without taking birth control (cuz thats the opposite of what i want lolol)