What's wrong with me? Help!

I'm 19 years old. I'm with my bestfriend of 8 years an we are trying to have a baby but no luck. I'm taking prenatal vitamins. I'm doing what I can to make it easy an nothing. At first I wanted it really bad but every time it came around to test I wasn't pregnant an I just got down an down, but I had symptons. Now I barley think about it an just sorta gave up but hope that it'll happen sooner or later an nothing. I'm hoping glow will help but nothing else has so far. Is there any advice or anything that I can start doing or take to help speed up the process? Please an thank you. ❤️