Moving in w/ Significant Other

Hey guys! So me and my boyfriend are planning to move in with eachother in late summer, early fall type deal, BUT. I just wanted to know how it played out for some of you guys? I work at a regular shmegular job in retail which I love, i'm only 17 and i know some are gonna say i shouldn't move with him but I want to and no one can convince me otherwise. But I just know upfront you literally have to pay double or triple your rent. Can someone give me some details on how it was for you moving into your first apartment either with a roommate or not i'm interested!