Am I being Paranoid?

I guess all parents would experienced what I am experiencing nowadays. My two children are growing up too fast. They become more and more demanding for spaces. I wish that they are still small so that it would be easier to control and monitor their movement. But now, they have their own circle of friends, own activities and interest. I am beginning to worry for nothing. I think I am using this words 'don't do that, don't do this' many times and am worried that as time goes by they will get bored and do not listen to me anymore. Where do I draw the line? Should I just keep quiet and let them go freely or should I restricted more. I just can't figure it out. Am worried again.. that one day they may just stop listening to me. I think I am overly protective of them and therefore their spaces becoming smaller for them to breathe.

My thought is that my children will try to understand that I am just trying to do what is best for them, but I guess it is overly done. My only hope is that I could learn to slowly let go as they expand their wing.