No, you're not.
There are 3 types of people who become successful classical pianists: the couple of people per generation who are true geniuses and whose sheer talent shines thru at an early age; people with money/connections/inside knowledge of the business and a lot of talent; and people with nerve/confidence and a lot of talent.
If you were type 1, you'd know it. Otherwise, you can start late if you want. The industry prefers to keep the myths and mystique alive to romanticise the business.
This is presuming that you want to be a successful classical pianist, a field I know well since my grandfather was one, my father was a jazz pianist and I studied at Juilliard before dropping out to start a rock band.
Go ahead and take piano lessons. Adult learners do a zillion times better than children because they are smarter, more motivated, have more brain power and learn easier, and they don't have to argue with anyone about practicing. I used to teach and every single adult progressed faster than the best children.