I seem to be sending the wrong signals to new coworkers. Whenever I'm forming a new relationship at work, especially if it's someone with whom I expect to be working closely, I tend to act overtly helpful and "nice" (being careful to avoid saying something offensive). They usually perceive this as a shy person who's a little nervous around new people (which is accurate), but is trying to make friends (wrong!wrong!wrong!). This gets me into trouble when they respond to what they think are "let's be friends" signals; I promptly put up barriers and withdraw, which they interpret as personal rejection!
How do I establish a new relationship that is open and respectful, but lets them know that it's just professional? (Hint to psycho-babblers: the magic word is "boundaries"). I'm not ready to risk scaring people, or fuelling gossip, with phrases like "Aspergers Syndrome","poor social skills", "communication difficulties", etc.