Do you think you still have time? Maybe you do. But actually, time waits for nobody. Before you know it, it will be too late to catch up with some of the things you had to at a certain time. As they always say that "make hay while the sun shines".
Regret for not singing when you had to. Writing, dancing, drawing and many other talents you are keeping inside of you. Don't jealous of those who did things at their right time and had good outcome.
The right time is now. Start now and immediately.