While I consider myself to be a fun and kind person, and I have very rarely been angry and even less commonly acted out of anger, people will often accuse me of being angry, being intimidating, etc. (I assume some of this comes from the fact that I am 6'5"). My roommate a while back (who I eventually became best of friends with) said that for the first few weeks, he was kinda scared of me. When I talk to people who don't know me well, I smile and such, but I still get asked if I am angry.

Basically, I am worried that I might be scaring girls (and others) off. Is there some way to use this to my advantage? Or else to better identify what is causing this and find a way to build positive rapport?