I'm miserable :(

Star
I've been TTC with my boyfriend for over 8 monts now and still no positive! I'm 18 years old and my mother has POS but my doctor says it's not hereditary. I'm so worried as I'm only young but I have been pregnant before and wa perfectly fine Except I had to have a termination as I was only thirteen, one of the main reasons i desperately want a baby now. It gets me so down when my AF comes and everytime I am a few days late I take a pregnancy test and get a BFN ! It really gets me so down. I've only been using glow for a month and a half now so I can't say glow is at all a bad app. Infact I like the hole community side as I an read others experiences. The one thing that gets me down is the success stories. Of course I am so so happy for everyone that has been successful but I just can't wait to post on that page! Any tips for TTC ?