I'm just so fed up...

I am so tried of being treated poorly for my weight. I just feel like giving up on life, because of how i am constantly treated. I use to get bulled for my weight in school, but i honestly feel like now that i am an adult the things that people do are way worse. I am not talked about or anything ( at least to my face) but i feel so ignored, and unimportant.
People at my job ( co workers) treat me as if what I have to say is irrelevant. Its mostly the men that do this, but some of the women have done it as well. I will be talking to them, or we are having a conversation, and out of nowhere a person comes up and they just cut me off mid conversation and start ignoring me. Even when someone isn't there they just cut me off and start doing something else. It is the most insulting thing that ive ever had to do with. I am so respectful and nice to everyone, but I am treated like dirt, because I am overweight. Im not just assuming this either, I notice how the other people are treated and its with respect and very normal.

A few weeks ago my brother used to work with me, and he is at a normal weight; I would notice how they treated him with so much respect and would welcome him into any conversation. When he wasn't there, those same people only would speak to me when they were asking about him. Now that he doesn't work there anymore, they only talk to me to ask about him.
Though im happy my little brother made friends I am just so deeply insulted how I could work there for a year and be treated like dirt, and he can come there for a few weeks, and make friends so easily. Whats sad was that they only spoke to me because I was his older sister. I'm just so over it. I have no motivation to even keep going with this weightloss journey, because I am growing to truly hate people. Not all of them of course, but just all the people who treat me this way. I know this should encourage me to keep going, but it has a reverse effect on me, my self esteem is spent. I already struggle to love myself as it is.

Its like in order to have friends I have to constantly keep trying to talk to them, in order for them to talk to me, and Im just over that... im just lost. Has anyone else had to deal with this issue? If so please tell me how you dealt with it, and how you stay motivated to keep losing weight. Thanks for reading.