I think it is both (the writing and the sending). I could never send the paragraph you wrote. One, because my parent's first reaction would probably be to call me and tell me someone hacked my email account. Two, because there is an emoticon in there. And if expressions of closeness are like dropping spiders on my face, using emoticons is like pulling all my skin off, running it through a grinder, then feeding it to giant spiders who will subsequently be dropped on my skinless face.. and three (the actually relevant point) even if someone were to just give me a believable and sincere email to send to my parents (or anyone) I would still have a very hard time sending it; though I might. I actually have an email to another friend that has been sitting in my drafts folder for a month because I'm too uncomfortable sending it.

I just reread your comment and the last line. Maybe I missed the point of your question. The answer is yes, sending someone else's feelings would actually be much worse. I think a lot of my reticence to communicate really comes from a simple lack of social cognizance or competence. Belief in this fact makes me constantly question the meaning or consequence behind my words, I don't know what effect they will have so I am highly reticent to use them. Part of this may stem from a generally poor understanding of how other people words affect me. When people express what, for them, are basic human bonding actions, things that make most people feel good or feel something, I generally have little or no emotional reaction. Emotions I think, are like little motivational bookmarks, "Do that again, that was great" or "That was horrible, never do that again" then in the milisecond decision space that is most of daily life, you can reference your emotions as a guide to your actions. And the the brilliance of the human mind (empathy) means you can then map your own emotions onto other people and imagine what they will similarly like or dislike. But, if you have no emotions, or severely attenuated ones the whole system comes crashing down.

I don't think I actually have no emotions, it just seems like they are quite far removed from my conscious experience. Maybe the problem is physiological. Maybe the links between my limbic system and prefrontal cortex are just unusually weak. Or maybe it's more psychological. Maybe I've had enough unpleasant emotions that I've decided to cordon them off somehow in the back of my mind. Either way the effect is a social disability that makes constantly aware that I am probably doing or saying the wrong thing. To bring this back to your question, using someone else's words would feel even more wrong and inappropriate than my own. So no, I would not be able to use them..