I get treated differently

Im a young single mom and I go to a conservative Christian university where having kids before marriage is seen as something sinful. I try my best not to bring up the subject not because I don't love my daughter, but because I don't want to hear the "why aren't you married" question & have to explain my story. I try to be friendly at school make friends, but as soon as they find out I have a daughter they begin to treat me like if something is wrong with me. I was getting close to a girl one of my classes, but once she found me on social media & saw pictures of my daughter.. she began to distance herself from me. Now, I dont really care about having friends but the fact that people treat me different once they find out makes me feel horrible. 
I have another friend that's a mom, but she's with her boyfriend (they go to the same university as me) and no one treats her differently. She suggested I try to talk to some guys.... but instead it ended off bringing myself esteem down. I had talked to one of her boyfriend's friends and he always seemed so nice to me.. so she suggested I try to add him on insta. I sent him a request, and I guess the fact that he saw my daughter's name in my bio scared him off, he rejected the request and never spoke to me again. After that happened people began to talk about me as if I have some sort of "disease." Like, I didn't know being a single mom makes me such a horrible person. I suffer from depression, I know I shouldn't care about what people say but I feel so sad, I love my daughter more than anything in the world & she will always be my number one. I just can't understand why people  treat me like if something is wrong with me.. has anyone gone through this? Any advice?