I don’t think any of us need to be told how to mountain bike. But maybe you’ve been missing something. Do you fit the criteria and conform to all the necessities?
https://www.youtube.com/watch?v=WPVRU7jSYkQ
There isn’t just one kind of mountain biker out there, obviously. What does your clothing say about your riding style? Does nature and tree hugging form a part of your everyday? And how is your relationship fairing?
Mate - you have the wrong bikeshop... mine keeps trying to sell me flat pedals and a 26er... or a jump bike, or a DH bike or some such...