Answer:
I belong to you but others use me more often than you do. What am I?
I can be simple or I can be complex. I can be found in this riddle or in everyday life. I can be shapes or even colors.
I have branches but no fruit trunk or leaves. What am I?
I am black and white. I have strings I have keys. I make sound without my lips. I make dough with no flour
What do you get when you cross a snowman with a vampire?
No matter how little or how much you use me, you change me every month.