How do you deal with people's expectations

So i work a job with a great pay. But i still live my life as if i am still working my old job with low pay. I still shop clearance and look for a good deal. Still drive my 15 year old car that looks like a beat up but i drive it with no problems. I wear non brand, neat clothes

People around me expect buying myself brand items, get a new car, , loan them money without expectations of paying back, or even buy them stuff. They think i am being stingy and cheap when i say no or don't do the stuff they expect me to do.

I just like to save money when i can and not spend when i can , except on my hobby which i have very high reasonable budget for.

How do you deal with those people?