Smoking weed pretty much every day, need help.?

So i've been smoking weed almost everyday for three weeks and after i smoked today i realized that i feel horrible. I've been lying to my parents so much, hanging out with the wrong crowd, depending on smoking to make me happy, ditching my friends and spending less time with my family and doing the things i love. The bad part is i wish i could take it all back, i used to be so against it saying "i dont need drugs to make me happy" but then thats what i turned to to make me happy the past month. I feel like everyone sees me as a complete retard now, i go out in public when i'm high with friends and i feel like i look and act pretty stupid. I feel like people look down on me as the scum of the earth, and i am beginning to believe that thats what i'm turning into. It gives me horrible side effects like anxiety, paranoia, makes me extreamly dizzy and depression. I just wish that i could go back and never of started it, but i know thats not possible. I just feel un pure and like i poisoned myself. Does anyone have any idea of how i could just stop feeling like this, I used to cut and i'm trying to not go back to that. I know i can probably deal with the peer pressure of them trying to get me to smoke. But i just need to stop feeling like i'm disgusting.