You have a great Granny.She cares! It is not a safe world any more.Find things to do indoors like baking,studying to improve yourself,draw, make cards for the children in the hospital at your local hospital. do things like that. Make up a poem, Soon you will be old enough to go where you want, but being young can be dangerous when you are out on your own. Listen to Granny and don't give her a hard time. She needs all the respect and help she can get in raising you.
Spend time with granny. I wouldn't send my grandkids out to roam either. She loves you and wants to protect you. Be thankful you have one that cares. Think of things you can do together even if it's just watching tv.