I wrote a song,and my cousin is thinking i'm a good singer,what should i do?

yesterday,i dabbled on a song,and my cousin walked in my room,heard me,saying it would be perfect for me to play once my dream comes true,but don't let me get started on that.but i want to be a actress on cartoon network,but i don't think i can do both.i'm only almost 12,so go easy on me.song name:you'll know.i always find trouble,and you try to get me out of it.you'll know,when i in trouble,you know,when i need help.i can't always tell,when i'm in trouble.your the only one,you'll know,when i am safe,you'll know when my life is threaten,you'll know when somethings wrong.you know,you'll know-,i'm the one who doesn't know,but i'm the one who always find trouble,you'll the one who knows.you-know-,you'll know when i am in trouble,you'll know,when i'm safe.you'll know,you'll know-,you'll know.