How can I stop sleep walking?

I'm 13.I am always sleep walking.Like I know that I'm sleepwalking when I do it but I wake up and when someone tells me I'm like what??Anyway How can I stop sleepwalking and sleeptalking?I will run from things that aren't there and one time I almost went outside.I'm also scared that I will say something very inappropriate while sleepwalking!Help me!(I have a lotta issues)