I feel like my son is not normal, am I crazy?

My son was kinda like that. He had severe reflux, so I never gave him tummy time because he would scream so much. He was held a lot too because if he cried for more than a few minutes he would projectile vomit everywhere. He also slept propped up in his car seat til he was about 4 months. So, he was slow to crawl... maybe 10 months I think is when he started to crawl. He never made a lot of sounds, which they later determined was because of the inflammation in his throat from the reflux, it hurt him to talk :( He never copied us really either, the Dr always asked and we just said "not really". He was a big boy though, he was almost off the charts up until his 12 mo checkup. He started walking at 12 months though, even being a late crawler. He didn't say any real words until he was about 19 months, but once he started he never stopped. By the time he was 2 he was really easy to understand and would have full conversations with us. He is now 3 years old, he is on track and way ahead on everything. Although he is small now lol, he is in the 7th percentile for height and the 10th for weight. He still wears size 18 month clothes. But he is perfectly healthy! At this point, I wouldn't worry too much about your son, and I honestly mean that. If he is still behind on things at 2 years, then I would worry a bit. Also, as long as he is going to his regular checkups with the Dr, I'm sure they are keeping an eye on him as well. Dont be afraid to ask them these questions though!