I still can't gain weight?

So... eating bacon cheeseburgers and drinking 5 glasses of milk a day wouldn't put a single pound on me, so I decided to buy a protein shake (syntha 6). I've been working out and drinking it twice a day plus eating normally like I did before I got it, and f*cking I haven't gained a single f*cking pound! If anything I LOSE weight before I gain ONE pound. Wth is wrong with me? D: I don't do any cardio, I lift heavy weights with few reps, and I'm not getting anywhere. I'm not even active at all I sit on my a$$ all day, I'm surprised I'm not obese. -_-