I want to learn piano but I don't wanna shell out for piano

get the sheets of something you genuinely like and try to learn to play it by heart. repeat

>>74668442
what if I don't really have any sheets I like and rather just want to learn to play the instrument?

>>74668777
then your intents are flawed, but this would be a rather philosophical discussion. If you just want 'to play the instrument' you should look for something where you're not focussed on the goal but also find pleasure in the way there. You can't learn an instrument by just playing the instrument, like lifting weights (although I think that my thoughts also apply to that field). You make small steps, and these steps are pieces that you like and learn.
Where does your wish to play piano come from? Do you want to impress girls or anybody else? Just forget it and do something else.

If I can't talk you out of it maybe try something like this:
https://www.youtube.com/watch?v=42qx4zVyjmw