If you play 20 minutes of piano once a week, in a year you will be excellent, I promise. If you do anything for 20 minutes a week, you will be excellent.
You don’t necessarily have to play any songs, just figure out the notes and how they fit together, and then rhythms and fun things. Build constantly. Play around.
I don’t know one full song on the piano, but I can definitely make music and sometimes work in the main melodies of pieces, if you know what I mean. It’s good enough to spice up a party or impress a girl.
So many people are unwilling to try, because they are afraid of looking stupid. When you are willing to fail in front of others, it frees you to try new things, which allows you to build skill as you are constantly trying new (because your not afraid of failing).