I first played piano when I was 5, and it was with my sister and a few friends. We all hated it, and I mean hated. I remember standing in the bathroom before our lesson and talking about how bad it was (it actually wasn't bad at all). So, we made up an excuse and quit about 2 years later.
When I was around 8 or 9, I started again with my sister and we had a weird teacher. We quit after only a few months.
My first a serious dream was to become a pop singer, and when I was 11 I started guitar lessons. The guy I took lessons from also taught piano (not classical, it was poorly taught piano). I realized how much I like piano and quit guitar. I never realized how little he was teaching me. He never taught me how to sight read, and he expected me to know how. After about 3 years I quit.
I started with this other woman who was more familiar with teaching little kids. She wasn't challenging me at all, and I had not really realized it. When I did, I quit. Somewhere in between that and getting a new teacher I realize that me true love was classical music, and I was determined to make a career of it. I quit with that piano teacher, and although he was a good pianist, he wouldn't push me and I knew I was ready for a great challenge.
Now, at 15, I have a true passion for piano, and continue to have one. I am starting with a new teacher, and I have been told that she has very high expectations, and is "no nonsense". It seems like a great match.
We quit piano for a number of reasons. Depending on the age, it could be just for the fact of it doesn't come naturally, and at an age like 5 we want to be the best of the best. As we continue to grow, we form more theoretical likes and dislikes, and soon we find out why and can back up our reasons for quiting. It could be purely that we find it time consuming, and not consuming for the right reasons. We could never realize our potential and the love we have for piano if we are not given the opportunity or we don't find a musical connection with out teachers.