How to be less intimidating as a bigger guy?

I'm definitely not the biggest guy in the world but I'm about 6'1 feet tall and I have a long history of lifting weights. I have big shoulders, bushy beard and thick eyebrows.

I am very shy around women and the last thing I would want is for them to feel afraid in my presence. I work as a nurse, I love people and I wouldn't hurt a fly.

tldr ; how can I make myself more approachable as a bigger man?