Why is my family kind of mean to me?

Well its just that my family is pretty mean to me im not talking about my mom or anything like that but more like my aunt and uncle and cousins! I will give you guys some examples well the other day we were regestering at another school me and my mom were going and my aunt wanted to come so we let her I was talking to the principle about regestering and what the school was like and just as we were getting up and he was going to show us the school and my aunt said oh I want to bring somthing up she has asbergers and people pick on her because of it. I was so mad I didint show it but I thought that was in my place to bring up I mean you cant even notice that I have it and people DO NOT pick on me because of it because I dont even tell them I have it so I have no idea why she would say such a thing. Another example is that the other day all my family was together my aunt and cousins and my older cousin (my cousins are all in there 40s fyi well my first cousins anyway) he was talking about his 17 year old daughter coming down shes my second cousin and I am 16 by the way. My other cousin and him were talking about it and my other cousin said oh the girls will want to spend time with her they are 18. I was not even brought up in the conversation!! They always are like oh there is such a big ag gap but I dont really think 1 and 2 years really is that big and I think I act mature I try to. I just dont understand why they dont want to ever spend time with me I ask them to hang out somtimes and everytime its oh we are relaxing today and im fine with that but I find out like an hour later they went somwhere fun I find out on facebook. It kills me that my cousin only 1 year older then me they want to hang out with and me they dont really like at all. Another thing is that my aunt is ALWAYS bringing up my asbergers I am getting sick of it she tells everyone I have it it makes me feel like im crazy or there is somthing wrong with me. So I guess what im asking is how do I get my family to respect me more and what to do when I am always left out and treated like im crazy or somthing. Sorry its so long and I apologize for any misspellings all help is appreciated!