I (20M) have a friend (21M) and we're both in college. I'm

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I (20M) have a friend (21M) and we're both in college. I'm 5'1 and he's 6'4. We've been hanging out for a while, but he does weird stuff when we're together. Like, because of my size, he'll pick me up and move me around just because he can, or he'll jokingly talk to me in a baby-voice. I know that he's just messing around but it's still unusual. He also always tries to control me. Like he makes all the plans when we hang, or he'll even make me ask to go to the bathroom when i'm at his place. I don't really argue because it's not a big deal. Recently, he did something insane, though. He was angry about something unrelated when we were hanging out the other day, and when I stood up to go to the bathroom, he grabbed me by the shoulders and told me to piss myself. I was scared and confused, then he told me to do it again. He was so mad and he spoke so stern, that I did it. I peed my pants right in front of him. I was really embarressed, but then he spoke really softly and nicley, and let me clean up. Why is he like this? What should i do?