Will people respect me more if I'm not overweight?
That depends on you.
They will like you and even respect you if you like yourself, act with confidence and hold up in your actions what you put up with your words.
In my case, I was always shy and introverted, easily intimidated and found it hard to socialize. But I actually looked pretty good, was tall and slender! Never liked myself though, and that is what people notice. You don't like yourself, you don't respect yourself, you don't stand up for nothing, so why would anyone else like you, respect you or stand up for you?
After my life took some detours, I'm now severely overweight (weight 160kg at 1,79m), but I "found myself", overcame my shyness, stopped caring about stupid details and started caring for the important stuff, started to like myself, love myself, respect myself and stand up for me and others in need.
And now nobody cares for how I look, but everybody respects me as I am.
So: stop worrying and start loving yourself as you are. The rest will follow.
Silence that stupid negative voice in your head and enjoy life.
Have fun! Bye