Thanks to you all for your time and answers (BlackHatCoiner,ranochigo,hosseinimr93,bitmover,ETFbitcoin,LoyceMobile, DireWolfM14, o_e_l_e_o, crwth, garlonicon,NotATether). I've read them all carefully, but it's hard for me to answer to each one, especially because I really don't know how to use quotes.
Bitcoin network is far more complex than I thought, really wonder if Satoshi was only one person, but this concept is brilliant.
Appreciate your explications, I've learned some new things.

To answer crwth's question ("I don't get why you are annoyed with it. Can you explain it further, OP?"):
My principle in life is to use something as much time as it's good, then recycle it to use it again etc. And I feel a bitcoin address will be good forever. And changing them at every new payment and then throwing them away forever makes me feel like a huge bitcoin-addresses-waster (although I know there can be 2^160 addreeses).

But I understand that's not a problem, because there are a lot.

Thanks for your answers!