Mother is confining me this summer?

My mother is confining me to the house the WHOLE summer. She won't let me hang out with my friends or enjoy doing anything outside. She just wants me to practice the piano the whole time. I've talked to her about it, but she keeps saying "Oh, I love you and that's why I want you to practice the piano". It's my summer though, I should be able to enjoy being a kid, but instead I'm just confined to this house either doing nothing or playing the piano. But at the same time I HAVE to agree with her and I don't want her to rage... Ughh. How can I stay sane?