I have the exact opposite problem...only weigh 90 lbs.
(runs in family)
Wish I could gain.
Believe it or not people can be rude because you are a tiny person. They stare and make rude remarks.
If you fall outside a very narrow window people are quite rude. And the window shifts depending on where you are.
I have long hair and I have gotten a number of rude remarks about it. Used to bother me as a child, especially when people would come up behind me and feel it.
Now I let children touch it but adults need to mind their manners. :)
People act like your appearance has something to do with them. It does not. I find a a "how rude!" or a yawn and "Please let me know when you are finished" tends to work.