You should not have to motivate yourself to enjoy your lifestyle. The enjoyment should come automatically.
When I was in my early twenties I very often had very little disposable income. Regardless, I found stuff to do. I’d pick up books from the local library, take walks, do crafty things to improve my quality of life. For example, one winter I noticed that running my heater was really expensive. So I mostly left it off and built a little “cave” out of $10 worth of PVC pipe and blankets. Inside was my computer and a space heater. I lived there all winter and played lots of games and talked with all kinds of people online.
If you’re more extraverted you should go talk to the neighbors more. Human connection makes anything bearable.
Now I have lots of money but I still make sure my lifestyle doesn’t outpace my earnings. Just don’t attach your happiness to money and it’s not hard.