How can a girl reduce her intimidatingness?

I've been told on countless occasions that I seem intimidating because of my competitive and sarcastic nature. I grew up as a competitive athlete amongst two brothers who always kept me on my toes with the constant pranks we used to play on one another.(one is a rugby player and the other is a marine) so I feel like that combination taught me how to stick up for myself and not take any bullsh*t but when it comes to dating I feel like this makes me unapproachable . How can I change this without compromising my beliefs?
How can a girl reduce her intimidatingness?
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