kaz if i could play minitherapy with you i'd say...first off , you look great..really really natural and "female"...there is nothing in your picture that hints male to me...second..what you really afraid of happening...you say you are not that strong..
I promise you that if you were clocked, it's a smile or smirk..over the years i was afraid (prior to transition of course)...I lurked in parking lots, turned my back on people, etc...

i was laughed at...mocked by a passerby who looked at me and smirked and said "nice dress" and burst out laughing...i was mocked by a clerk "are you kidding me??"... i was yelled at across the street "hey tranny!! hey you!! hey dude!! " etc..
nobody was more scared than me...you can do it..and before you tell me how big you are i have been out at 6'2" 235 lbs...hairy arms and legs...it took me awhile..but in the end you just practice babysteps..and soon you are shopping on the high street and having people call you maam in between any awkward moments you may have.

also read alexia's point...i am a believer that the fear word is really better thought of as the "guilt and shame" words...its so prevalent in the ts and cd world, even the concept of starting a thread like this oozes shame..

It's not easy to deal with an issue that causes you to feel like you are a lower form of life, but that's just what shame does to you... and the closer you are to feeling this is your identity (rather than your fetish or a turn on), the worse it is, the closer it is to your identity, the more you want to go out and express yourself, and the more you try to avoid the horrible feeling that your identity is not working out there in the real world....by standing up to whatever happens, you feed your identity, and you learn (even though it can be rough) to just be yourself, and the rewards are really wonderful if you can do it..