I agree with the others. You need to talk with the BO. They may not even be aware of all that you do. Do go in sounding like you are angling for freebies, just lay out that you are doing a lot of work, which you enjoy doing, and you would keep on doing for the exchange of lessons.
It sounds like you are like me, in that you are a very shy girl. Maybe pick out another girl in the barn and try to build up a friendship with her. You already have a basis....your love of horses! Having a human friend at the barn can help you build up your spirit, too.
Good luck, Kayla. Keep us posted.
ps: My 14 year old son says if you want a friend in the US, e-mail me here & I'll pass on his e-mail to you. He's a horsey kid, too!