The only advice that I can give is to force yourself to try. I'm a naturally introverted person but I pushed myself get outside my comfort zone again and again. When I asked my future wife out on a date, I didn't think I could do it in person, so I asked her out over email. I figured she was out of my league (and she was)... but I told myself "it's better to ask and get a 'no' than never ask and get a 'no' by default." Be ready for the pain of rejection, but force yourself to do it anyway.

However I don't know you and the mountains you face. They are likely different from mine and require a different path. Good luck finding your path and getting to the second part of the comment.