Hi L., my son was also not crawling at 9 mos and hated being on his belly. What was hard for us is that he wanted to move so badly to reach things - he was so frustrated. With a lot of help from daycare teachers, he gradually accepted being on his belly for longer periods of time and then crawled at 10-11 months. He never really liked it though. However, he started walking at 12 months! and now at 17 months, loves to run and dance! Climbing is his new thing.
When we were at the not crawling stage, I was really worried, but he turned out to be fine. Many babies skip crawling and I didn't know that myself at the time and that contributed to my worry. Glad you asked this question.