Almost 6 months old and still not crawling?!?

My daughter will be 6 months old in a week. She isn’t even close to crawling and I feel like she never will be! Lol every time I put her on her stomach she just rolls over!!! She will not stay. She’s been sitting up unassisted sense she was about 4.5 months old so she LOVESSS doing that but to put her on her stomach?!? She isn’t having it and literally rolls over the second I put her down. Is this normal???

Edit : instead of replying to all of your comments individually this is easier! Thank you all SO MUCH. You have all eased my mind!! I’m a ftm and I have no idea when but I saw other moms babies the same age crawling already so I was curious! Lol