Re: No Fire ?
My advice to you is to not use astrology as an excuse. The stars do not control our actions, they just influence the way we see things.
As someone with no Fire in my chart, as well, I can assure you that real confidence is something you build through self-discipline and steady work, brick by brick.
What fire signs give is not "confidence", per se, but faith. Faith in life, the Universe, and yourself comes naturally to those with healthy doses of Fire in their charts, but the important thing to realize is that they don't posess any superpowers, they are just people, like you, who dare and risk more than you do.
It's like they say, no pain, no gain.
The reason why bit might be more difficult for those with no Fire to take a leap of faith is simply because they are lacking in the faith department, so they won't even try to visualize or let their hopefulness fly, because they rely on other things for survival...for you, with lots of air, you probably rely too much on reason and try to break everything down to abstract thinking, which is not always the way to get things done.
I am about 40% Water, 40% Earth, and 20% Air, so even harder for me to have faith.
With heavy earth influences, I need to see it to believe it, and do rely heavily in natural laws, I stick to nature and hate risking.
But courage comes pretty easily to me. It's simply an attitude. I just say to myself: "There's no point to getting emotional. The only chance I have to get what I want is by going after it with all I've got." and it generally works.
Believe me, I know fear and anxiety like no other. But I think I'm doing pretty good for an overly-sensitive and timid little fish.(Pisces Sun, Mercury, Venus, North Node).
It took many years to learn to even partially control my extremely volatile emotions, though.
I guess aspects count a lot, as well. I give a lot of credit to my Sun-Pluto trine, and Moon-Mars-Jupiter multiple conjunction(Moon in Taurus, Mars and Jupiter in Gemini)