Be your true, authentic self and develop your self confidence, and don't let naysayers ever get you down. Some jobs may not work out but others will. Keep at it til you find one you like
I have no advice that others haven't already touched on, but I just want you to know I hope you are able to get the same type of life others get where you can live in the body you are comfortable in while also being able to get a job.
I am sad you feel scared that no one will hire you, but that's not a failing on your part and instead a failing on the part of the societies we live in, and that's not fair.
I'd say, if they won't hire you because you are a trans person, then you don't want to work for them.
And if you do hire on to such a place, you'll watch your soul dwindle away slaving for industrialists who don't believe you should be allowed to exist.
Hey, I know you're looking for reassurance, though I hope you'll accept a little wisdom:
It is absolutely okay to be scared. Accept that you are, even admit it to some degree, and try anyway. :) The unknown and the uncertain is so very often what truly terrifies many of us, beneath whatever label we place upon it. The best a large majority are ever able to do, even those with experience, is to keep on going. Someone else said to "be authentic" and I agree, though also make sure to be authentic to yourself, not just your authentic self to others.
If you don't shoot you'll always miss. Right now believe in that you can handle the situation when you're there in that moment. In the worst case you'll face failure, but that's a natural part of growth. Imagine living in 10 years and how this experience will shape you vs not doing it.
When it comes to handling the situation, it's best to be your authentic self and accept yourself. In my experience people tend to follow what they read in the room, and if you're not questioning yourself and just act like everything is normal, then they will follow along.
Maybe in your area it's different but you won't know until you give it a go! I can't imagine living life as a transwoman without courage.
For what it's worth, saw an mtf working at a large retailer about a year ago, then another in the pharmacy at a major drug store chain about a week ago; also knew of another who worked at a major home improvement chain in my old hometown (all in the U.S.).