My appearance contradicts my personality...

I have a problem, I am a pretty strong guy. My face is a stern one and when I meet new people it takes a little longer than usual for people to realize I am a really friendly, laid back guy. I give the impression that I am tough and have a "cut the sh*t" attitude just because of my structure (I am fairly large, in a built way) and face.

I feel like any girl that would fall for me would expect the tough guy and realize I am actually just a teddy bear/gentle giant and leave. I have had a few problems with previous relationships and I think that might be part of it. All of my friends say I am the nicest person they know, and when I greet people I pass (just to be friendly) they either get scared, confused, or self conscious.

How can I stop having people think I'm a brute or bully and realize my true nature? It doesn't matter if I smile or not... I already tried that.
My appearance contradicts my personality...
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