Sometimes I just want to cry. I'm trapped

These four walls can be so sufficating sometimes. I can't stand it in this house. Not because I have a shitty family life, because I don't. My parents are still married and more impressively still love each other. I get along just fine with my siblings. We don't have much money, but generally we live a happy, comfortable life. But sometimes my mother drives me crazy. Her mood swings give me whiplash, and she does these little things that just get under my skin. Like chooseing a family photo for her Facebook DP, that just so happens to be not only VERY unflattering to me, but the thumbnail is literally ONLY of me! What makes a picture of your daughter, at one of her heaviest points (when she has allready told you not to post pictures of her) a good choice for your profile?