I love your post. So inspiring and I respect people like you. To not be scared of the stares and giggles. It is your goal and you are gonna do it. No fear. Letting go of everything except your desire to learn to ride a bike. I love it!
And do what everybody says. Scoot along with just your legs and feet. Do it on the grass in a big field if you are scared to fall on the concrete. Then slowly start trying the pedals. I have all the faith in the world you are going to love it! Especially riding your bike with your son. I hope you let your son watch you try it. There is a lesson here for him.
So much respect for you.