What is the name of this movie?

ok so I was surfing the channels at night and came upon this movie. i started in the middle i guess anyways there is this guy who's not the most social he has a crush on this girl he works with and she's pretty and all but she's not so great at her job and gets picked on by her boss. He becomes so infatuated with her and also want to have with her because he saw in a catalog a doll or something and bought it. i remember the funny part was that it came in such a large box and he lives in an apartment and he's trying to get it in his apartment when a neighbor comes to helps and recommend that they open the box and take whatever is inside out. He then just gets scared and tells the guy to leave and he somehow got it inside. anyways i remember that he puts it together and has with it and imagines the girls face when he's having with the doll. anyways he's still infatuated with the girls and he continues having with the doll i guess. I was probably switching around channels and when i came back to it he's a bit more confident he talks to the girl and helps her with her work and made a deal with her it was silly noting ual that i remember. anyways they become close they went out and they hooked up but when he was having sex with the girl now he kept having images of the dolls face. i though that was some humorous irony, anyways he couldn't finish i guess and they didn't part ways but he continued to have nightmares and just flashes of him having sex with the doll and the dolls face. He got fed up and decided to get rid of the sex doll, this was the funny part the doll was fairly big so he took it out late at night and threw her in a different dumpster no one would know it was him. this is where i stopped watching or went to sleep. It wasn't the greatest film but i thought it was funny even though i doubt it was intended to be if you know the name of the movie let me know. thanks.