How clingy is too clingy?

https://78.media.tumblr.com/tumblr_m611lddZsx1qm29seo1_500.gif http://i.imgur.com/262OFQ5.gif

Usually I don't really mind clinginess, usually. I don't mind if my girl wants to spend all day with me, most of the time. I don't mind sharing my hobbies either. However, when they start getting pissed at me for going to hang with my brothers or friends, than it get's more than irritating. There are also days I just need to be by myself, I always was used to the loner style of life when I was younger, and while I'm far more social now, A part of it is still there. And I just need time by myself to contemplate life, and my decisions. Other times I need alone time is when usually getting rid of frustration, Since I get very physically violent, I'd rather be alone and just pound on the bag. Much easier to let loose when not worrying about anyone else. But just time spent with me, Like I said, it can be all day for days, as long as I can do what I want during it.