Questions about Zoloft.

I was recently prescribed Zoloft for my depression, I was given Lexapro years ago, but I didn't like it because it made me feel numb. I wasn't sad anymore, but I wasn't happy either. I am currently blue most the time, but I do usually find moments of happiness in each day. I don't want to feel like a zombie, but I do want to get better. Thoughts?

Also worth mentioning, I smoke weed habitually, drink moderately, and have a hyper active sex drive. I'm trying to get clean but every time I go cold turkey, I think about getting high constantly, relapse then feel worthless and watch my life fall apart. I don't want really want to trade one drug for another, but I can't live like this anymore.