What I want

These days, I don't want things.

OR: These days, I don't want possessions.

Until a few years ago, I wanted something things like clothes, bags and so on.
When I got something (that) I wanted, I was so excited and happy.

Now, I want much experiences and memories more than things. OR: ...more than possessions.

To be honest, I might get bored to buy something of buying things. 

According to one study, pleasant experiences makes people happier than getting things.
I hadn't might notice that, Although I hadn't known about the study, but I already understood that.

I hope that I enjoy myself everyday life now and forever, even if I don't have many things.

Thank you for reading!

I think you should pay more attention to the way use past tenses. 

When I got something that I want, I was so excited and happy. - can you find a mistake here?

Now, I want much experiences and memories than things. Than is a comparative preposition. However, you don't have the comparative more. Study this: http://learnenglishteens.britishcouncil.org/grammar-vocabulary/grammar-videos/comparative-and-superlative-adjectives