Ok. I've been playing the piano for 2 years. Just by myself, no instructor, no teacher. When I watch someone who is "piano educated" play the piano, their fingers are always curved. But when i play there are certain parts that i have to flatten out my fingers, and eventually my fingers are sorta wierd now. they are all crooked when i flatten it. this every happen to anybody?

You should always have your fingers with a little arch, and I beleve that there are SOME parts when played when you NEED to stratch your fingers flat--but that's very rare for most music.

Even when I'm doing very fast octaves in my own technical etudes I try to keep my hands as arched as possible to keep the notes all evenly sounding and to build up my tech (that's their for!).

Letting your fingers fall flat isn't that good unless your highly skilled. The reason: Your more likely to hit a wrong key by the corner. But maze makes a good point, it happens, and when it does you have to.

Try and curl your fingers at the least slightly. It helps a lot on long, fast runs.

well i saw this video the guy showed how the hands are positioned in the keyboard.. it goes something like the elbow should be parallel to the keys and as for the fingers he held an apple(a tennis ball would do to or anything about the same size) then wrapped the fingers above it then placed it on the keys then removed that apple then he said that's the position..

thanks for the tips and infos.

It's good to have the flexibility of trying different ways of playing (i.e. fingers curled/flat etc)
so you don't become limited or get stuck with certain habits when you reach higher levels.

So it's okay to step away from the preconception that your fingers should be curved or your hands should be in some position.
Try everything and see what works for you.