TTC is really getting me down

This is our 8th month trying. I’m 20 an my partner is 21. Neither of us smoke and we don’t have any health problems. I’m starting to feel like a failure! My fiancé and I long for a child and I feel so bad that I can’t give him that. I have three apps ( glow, Ovia and flow) that I use to track my periods, ovulation etc. Each month the apps show different dates of ovulation and we make sure to bd on and around all of the dates so that we don’t miss ovulation. It just honestly sucks, I can’t help but worry that I’ll never be able to give us the family we crave!