LOL, depends on how you define "horse"
My first "horse" was a 34" tall mini-burro. We have some friends who run a large feedlot and this little 2 year old jack (intact, not gelded, not broke..even to lead) just showed up on one of the incoming cattle trucks LOL. Friends didn't have any use for him and didn't want to keep him so they gave him to my Dad for free. Well, he and my brother broke him to cart first, then about a year later (when he and I were both 3 years old), I started riding him. He was frustrating and a bit obnoxious and he gave me my very first taste of getting bucked off, but I rode that little butt everywhere, even working cattle. Olen is still with us, retired out in the pasture now at 29 years old. However, occasionally my 4 year old neice will come over and spend some time with him as he is also her
first "horsey" LOL.
About a year later, my brother got a new horse so I got to move up to his old one. So, Buck became my first honest to goodness real horse. He was quite the outlaw in his younger years (he was bred and belonged to the same folks that gave us the donkey). He had hurt a couple of cowboys pretty dang bad and his owner was in the process of loading him onto a truck with a load of cattle headed to the killer. My Dad happened to be there that day and managed to talk Craig into giving the horse to him. Well, after several years that consisted of a lot of training and some really big fights, Dad got him really broke. Buck just sort of lucked into his lot in life as a kid horse when my Brother climbed on him one day while he was tied to the fence as my Dad was roping.
From that day forward, if there was a kid or begginer that needed a horse to ride, Buck was the first stop because he could be 100% trusted with anyone and anything. I don't know if it was his outlaw nature or his life experience that made him this way, but he was literally not scared of anything. I had a kid throw a pack of black cat firecrackers under his feet and old Buck never even flinched as they went off. I loved that old boy and I still miss him even though he's been gone about 10 years.