Anissa - I am sorry to hear that it did not work this time, I'm so sorry

Give yourself time to get over this and then focus on the FET. You are correct, everything does happen for a reason. When we didn't get a heartbeat at 6 weeks on our 2nd try I was so upset, but my Sister-in-Law told me that is when the heart is forming and more than likely there was something wrong with the heart and my body realized it and stopped the pregnancy. (She's a pediatric cardiologist)
Having 6 frozen is awesome! One of my doctors told me FET's are easier on your body as you don't have to go through the stimulation and surgery of a ER. I'll bet 3rd time is a charm for you!
Have you tried acupuncture on either of your cycles? I didn't for my first 3 but my new doctor said research really shows it helps and my beta numbers are really high, so I'm now a believer. My insurance doesn't pay for any of it, so we are barely staying afloat but I know it will all be worth it in the end.
Keep me updated so I can follow you and help you keep up the PMA on your FET. You are still young, so keep that chin up ... it will happen for you!
Sending hugs.