I'm 19 and I think I'm infertile.

Me and my long time boyfriend have literally been trying for months and it's so depressing when my period finally shows up. It can be weeks late and then he gets so excited and then it finally decides to show up. It's the most depressing thing ever. We want a kid so bad and it's literally the most difficult thing for us. I was on depo for a while but I stopped a long time ago. I was able to get pregnant on the shot but that ended in m/c and ever since I've stopped using the shot i can not get pregnant. Someone please explain to me what the hell is going on 😩