So people at my job said I'm fat::: it hurt my feelings a bit?

I'm 5ft6 and weigh between 160-165 lbs::: I'm in the process of trying to Lose weight and they told me I have gotten fat and I have I have gained about 10 lbs but that hurt my feeling bc I am very sensitive about my weight :::: they are always saying something about how I look :: especially thi one guy which I don't like ::: it kind of hurts my self esteem especially when I am trying to conquer being fat in trying to lose weight :: I just don't know how to over cone this or deal with people like the people I work with who are so negative :: what do u suggest???