No I think it is the opposite. By not telling them until you feel ready you are keeping them from worrying which is a very selfLESS thing to do. This is a little bit different because I was a child but my mother had HIV since she was pregnant with me but didn't disclose it to me until I was 14.(it had gone into AIDS by then) I wasn't angry when I found out-she waited until she felt it was the best time to tell me.

You'll know when the time is right to tell them