Girly, don't set yourself up for failure. I've been there. I suffered from a lot of depression when I was younger, and horses were my outlet from a crappy home life when I lived with a less than loving parent for a few years. After living in that environment, I really got the feeling that I would never be good at anything. I got a late start into horses compared to the kids I was showing with, and always told myself I could never beat them, they were showing horses that cost thousands more than mine. I joined a 4H group so I could get help from people with more experience, show at 4H shows (I also showed at open shows) and meet friends with similar interests. Now, I never felt equal on the playing field the first few years, but I certainly learned a LOT more about showing than I knew when I started. My last year of 4H I bought a cheap miniature colt, had him gelded, and he was my project horse. Well, I won all of my 4H roundup shows, district show, and won his state championship. Thats when I realized that EVERY horse is good at something. He matured with a few conformation flaws for AMHR halter so I sold him to a family who put minimal driving training into him, and are placing well with him against horses with years of driving training (they went 6th out of 22 at states this year, not bad for a horse with less than 60 days driving training). That horse had a couple obvious conformation flaws when I was showing him, the important part is making sure your turnout is IMMACULATE and knowing how to hide some flaws. If I took that horse into the ring not groomed to the hilt, He wouldn't have won. You need to wow the judges one way or another.
And I also previously showed a gelding who was a minimal dwarf. Yep, I showed a dwarf. He wasn't mine, and at the time I was young and didn't know he had any dwarf characteristics. I showed him in "in hand obstacle" and he won every time out, even at the district level. Even though I was only showing him in performance classes, I still groomed him like I was showing him in halter. Actually, we were in the newspaper once because there was a reporter at that 4H roundup. I would have been mighty embarrassed if I had him there not groomed.
I dont think anyone here started out with a National champion horse, you start low and work your way up. If you give up, you'll never get to where you want to be. Wish you lived by me, we would go to some shows together