Can anyone free to give me some advice???

It is not possible to learn by by self???
From what I have read, everyone was stated that you must buy a good quality piano----mean expensive.......so that you will put your heart into learning.

I already 18 years old, so I m learning for fun but with heart not for --professional pianist.....

I only aim for know how to play some songs.......

it is only hard-graded ppl can play piano by ear???
I mean just hear the song then can play with piano????