Jennifer,
Oh well if you are good with a sim and have flown for 5 years then you should be good to go

I am also 15 and fly with my dad regularly-
But yeah, i have heard alot of good things about the Yak 55....more power=more fun

What you do with your dad is different. My sisters are always complaining about my dad spending too much time with me instead of them.
Are you an only child?