I have a bad family situation. Please Help!?

My name is Nick. I love to be around family no matter. I discovered that they don't care about me. They use me and then after they want to get rid of me. I come from a family full of girls so I am the guy they call when they need to move or something. I have another cousin that they would rather be around than me. The crazy thing is that he does not like them and he shows it. He never calls them or anything and does not want to be around them. I love to be around them, but it hurts my feelings, that as much as I do for them and hope that they would want to be around me. They don't. They would rather spend time and money on someone that does nothing for them and doesn't like them. So they say they care. But they never call me but when they need something. So I call them and they act like I bother them. They try to call and get in touch with him. But not me. So I tried to be strong and not show I care. But I moved to ATL from Chicago and they still don't call me. One of them took that cousin in and let him live with them. But I cant go over there or anything. Example: Last time I stopped by, She asked me what the hell I was doing at her house and she told me to get the hell out. That hurt my feelings really bad. I just wanted to die at that moment. I wrote a song and sent it to them. It was iffy from the start. I was just trying to prove my tough side. I was saying a whole lot of things that were true in like a rap I wrote. Of course my cousin ran to his mommy and is now threatening me with harment. Which in IL there is some new law or something. Which would send me to jail for 6 months. So I am like that proves right there that they don't care about me. My mother says I am to sensitive, I cry over a lot of things that hurt my feelings. I cant help it. Hearing that makes it worst. What should I do regarding my family. To me I keep saying they are dead to me. But I always think things would get better by doing things for them but always the same. Do I have the right to feel like this and is it ok to be sensitive. I come from a sensitive family. I just turned 18 and it is so hard. I try not to cry but cant help it.