Can you clear up some rumors I heard about the USMC?

I heard some crazy stuff about the Marine Corps. I heard from one friend, he got out at like week 3 or something of recruit training, he said he dropped out cause the Drill SGT's or Instructors (I'm not sure what there called, I apologize) hit him like punched him in the head a few times, and threw him around the barracks, and a couple nights he said they came in while everyone was sleeping and tossed there bunks while they were still in them. And a lot of recruits got hurt and they just stood there laughing and yelling. I also heard from somebody that at the rifle range during recruit training he missed a target and the D.I grabbed him and threw him on the ground and grabbed his rifle and hit him in the face with it and told him "every time you miss I hit you". I heard some other crazy stuff to,but WAY to much to type and those specific two were the ones that really threw me off. Cause I'm actually thinking about joining. Is this stuff true? Do they really throw you around, hit you, punch you, smack you around, hit you with weapons, etc? IDK The first guy that told me that I was like "yeah right" but when my other friend (these 2 guys don't know each other) told me something vary similar I got a little worried. I mean I want to join the military, I really do and I'm still kind of interested in the Marines, but being tossed of fYour bunk and hit in the face with your weapon? I mean call me a b*tch all you want,I would hate to have that happen to me. Or is this all B.S? Please explain.