Congratulations on the changes you've made thus far.
You must decide which is more fearful for you - living the life of an obese person - or having to deal with some attention. I know that sounds harsh, but that's really what it all boils down to.
Luckily, we don't become "slim" overnight. We get to learn and adjust to it along the way. I think you may be suprised that you can really handle the attention, that you're stronger then you think and that it's waaaaaay better to have to handle that attention, then to remain obese. To remain not living the best life that is possible for you.
Hey, and if you find it's just too much to take, you can always gain the weight back
. Just kidding. Just kidding. Believe me, that WON'T be the case.
There are always going to be fears with something new, the unknown. Don't let that hold you back.
As far as being motivated, forget about that. Fake it til you make it and all that stuff. You really need to make a
commitment to exercise and lose the weight. How do you want to spend your life? Wondering and wishing and hoping to be slim - or
being slim with all the incredible benefits that comes with it?