http://kevan.org/johari
It might be a handy tool.

You appear to me...
* sometimes difficult to find the right face to wear or words to say, is that feeling difficult of what role to play what character to have/show...?
* friendly yet distant (not to me but others, I feel) both because of your kindness, people feel easy to reach you but know nothing to do with u, that you rarely show interests other than sports, say, you never joined the excited discussion of Japanese movies.
* sporty, have never seen you baffled by any sport.
* busy, always things to do places to visit.
* helpful, always involved in activities (voluntarily or involuntarily)
* hardworking, this one is from both observation and feeling.
* tense, somehow you never look really relaxed
* somehow I feel you're denying yourself in some fields yet trying hard in 'em, say, language, and it makes your trying even harder...
* somehow refusing to show true emotion, erm, that is usual for human beings, but, this thing appears quite obviously on you. (I don't think you like the word "shy".)

You know what... it's very disgusting to me to give such words like these to a guy (and that's y english, words get more disgusting in chinese) , hm, let's put it this way, to many people you're a friend worth being treated wholeheartedly.

hm... I don't see any need for you to change; there isn't a standard/perfect character.
Maybe at times you find you didn't act the way you wanted, but... that's fine.

hmmm it's hard to describe a person, really.
Dont take my words seriously 'cause I myself am unsure about 'em, cannot really tell the feeling towards you; feelings get vague when you wanna grab 'em, and, I suppose you want the bad things mainly so I focus on 'em.