Why do I hate guys that are clingy? And why are all guys so clingy?

Every guy I have ever dated is super chill until we actually start dating. Then all of a sudden they are at my side constantly, needing to touch me or talk to me somehow. If we're at a party and I am talking with somebody, they're there. Or at the bar with a group of people and I go to get drinks or do something with someone else they have to follow. And hold my hand while doing so. And they constantly ask if I'm alright and do all this cutesie talk in front of everyone which I find embarassing. And they get offended when I say no if they tell me to sit down with them while I'm talking to someone, or if I walk away without them. And they must know EVERYTHING. i.e.: I was going to get a ride home from a friend at the bar, they were giving me and a couple other people rides but they didn't want anybody knowing they were doing so because they didn't want people asking them for rides. I told my boyfriend I had a ride and was leaving soon, and he asked who was giving me the ride, and there were like 7 people standing around listening to our conversation so I told him I'm not supposed to tell anyone as they didn't want people knowing they were offering rides. And he kept asking and I would say no and I finally just told him cause he was pissing me off and was holding onto me and wouldn't let me walk away unless I told him (believe me, I tried to walk away).

I hate when guys do this, why are guys like this? I have broken up with 3 guys because they get so clingy.