Scared I'm not fertile

I'm 18 and not looking to have a baby right now but I really want one in the future I'm kinda scared I'm not able to I'm on birth control right now but even before the pill my periods were always a hit or miss I used to starve myself and ever since my periods haven't been normal I don't starve myself anymore one time I got my period 3 times it 5 weeks that was almost 15 months ago i get my period normally once a month or every 5/6 weeks but it's been nearly two month without my period I didn't take my birth control for one night and a few days later my boyfriend came in me I took a pregnancy test today and I kinda was disappointed with my results don't get me wrong I'm happy I'm not pregnant but what if I'm not fertile honestly I might just be being a teen and overreacting feel free to tell me I'm dramatic there has been a few times I've had a mess up with a guy no one ever came in me but there were so many times I didn't use any type of protection beside pulling out & never got pregnant again I'm not trying to have a baby right now I'm just super scared that I won't be able to in the future