Anybody else like me and refuses to sell until it’s life changing?

The sensible thing to do in my position is to sell and enjoy some substantial profits, not life changing, but enough to buy a nice average car for example.

Stubborn me refuses to sell as I’d hate to think how I’d feel if I looked at prices in the future and realised I could have paid off my mortgage. So to sum up I’d rather lose it all than sell and miss out on mega profits. It’s rather stupid thinking.