If nobody is reading your tweets, then they fail due to one or more of the following:
1) You aren't saying anything worth reading
2) You don't know how to use retweet (RT) to publish replies to people you are following so that people can read them if they search for that person's @profilename
3) You don't participate in any hashtag groups
I'm guessing #1 is the worst problem, since teenagers usually have nothing to say that someone else hasn't already said in a more clever or amusing way, and then #2 and #3 are probably tied.