In my circumstances, it's very hard for me to attend go classes or participate in tournaments. Do you think that one can become a good go player just through playing on the Internet? Thanks to the remarkable spread of the Internet recently, you can play anywhere, anytime, which is really great. However, I don't think that you can become a good player just through playing games, whether or not on the Net. It's important to develop your strength through actual play, but besides that you have to review your games and learn good shape from books on josekis and tesujis. You have to study privately. Otherwise, you'll just keep repeating the same mistakes, slip up through ignorance of correct shape, and so on. These days there are also study pages on the Net, so how about giving them a try?