Yeah, that just doesn't pass the simplest sniff tests. I barely use iMessage, and yet I'm an iPhone user. Basically everyone around me is the same.
A single anecdote isn't data. You're not a typical consumer.
The only major market where iPhone outsells Android (number of handsets) is the US, and it's because of iMessage. Android is 70% of the world market and dominates LatAm, Africa, and Asia.
iOS vs Android isn’t relevant when discussing hardware. It’s Apple vs Samsung etc. iOS doesn’t need majority market ownership for Apple to completely dominate their hardware competitors in a market.
iPhones are more expensive, on average, for a similar or worse experience. The thing that drives iphone sales is social. People want iPhones because their friends do, and that's a very good reason.