[assuming you meant "learned"]
The simple answer is yes --you can learn to play piano without formal lessons. The folks on Q&A sites like this one can help you, as well as the abundance of online resources (and books!) devoted to piano instruction. (Patient friends can be helpful too.) The good thing about self-teaching piano is that it's easier to learn by watching than, say, a wind instrument, where the minute details of tongue placement make all the difference. YouTube is also full of pianists trying to share their knowledge. Services such as Google Helpouts have some on-call people offering musical instruction (typically not free).
Would it be easier to learn with a skilled teacher? Yes, but in some ways, it is more of an adventure to just learn to play what you want to play --as long as you are passionate about improving and learning more, you should progress. Since you seem prepared to devote some serious time towards mastering the piano, I think you will eventually become a fairly competent pianist in time, if you put a lot of heart into it. Internationally famous? Nobody could promise you that, even if you were taking lessons from a world-class instructor.
If you're going to self-teach, just remember that there's typically a lot of research involved (mostly a lot of Googling). (But that's part of the fun!)