My own mother does not trust me?

I have good grades, i stay out of trouble, im always in the house and never in the streets, but when ever i wanna hang out with my friends she freaks out because she thinks im going to have sex, or do drugs. I tell my mom each and everyday i would never do that to her, not like how my sister did. My sister smoked weed, drinked, had sex, ran away from the house, skipped class, failed her sophomore year, got pregnant, dropped outta high school, talked back to mother all the time, its like all that i remember from my childhood is my sister and all of her problems. My sister basically ****** my life up. She is older then mme by 7 years and im 15 now. But my point is my sister did all the WRONG things and now i have to suffer the consequences. I have good grades and im a good person its just my mother does not trust me because of my sister. i told my mother a million times IM NOT HER, and that i can think for myself. and that i will never make the same mistakes she made. She just doesn't get it. My mother keeps pushing me away and i dont know what to do. So tell me what you guys think and thanks in advance.