Is it weird to grieve for a celebrity??? Ryan Dunn?

Your reaction is very normal, hon. You enjoyed Dunn's performances, admired him -- sure his death feels personal to you. You will "get over it" in the sense that it will not hurt you, after a while, though you will still miss him. You should find, however, that after some amount of time -- really, I can't say how long, it's different for everybody -- you will be able to watch his performances again and laugh. You will not be disrespecting his death; you will be appreciating what he did in life.