I'm so lonely and sad

I went to a class/group therapy for vets with PTSD at the VA (I'm a veteran), and I had a tough time during class bc of the topic that was being discussed (radical acceptance) and I spoke and said that i am unable to accept the things that have happened to me in my life, bc the one living relative i have left in the world (my father) is not a good person and i am better off not speaking to him and being far away from him, so i dont speak to him, and i'm several states away. The bad thing is that i have no other living relatives left anywhere in the world, my mother died when i was 2 months old and i have no memory of her, her parents raised me and were the last people that trulu loved me and took care of me and showed interest in my life and wanted me to be happy and showed me that they loved me. They died when i was 13 and 14. I am 37 now. I went to go ive with me father and stepmother when i was 15 and lived with those people for 5 years and it was absolutely awful, when i was 20 i took all my stuff and left, and i've been all alone in the world ever since. This sucks and i hate it. I dont even have any friends in this city I live in, because of bad experiences with friends taking advantage of my kindness. with mother's day being tomorrow, I'm very very sad bc I never got to know my mom and ill never be able to, and my grandparents are dead too. I had hoped with all my heart that by now I'd be married and have children of my own, but apparently i have too many issues for anyone to want to deal with or for anyone to want to put up with me. I dont know what the problem is. My one hope for my life to get and feel better since I was 13 has been that someday I'll meet someone that can love me and want to share life with me and someday we'll get married and have a baby or two, and at least after being married then i'd be a part of a family again, even if were just the two of us; or if I had a long term serious boyfriend then i'd have someone to be there for me that I can love and I can be there for him, and I'd feel like i was a part of this thing called life. Right now I feel like I'm some kind of outcast of society bc everyone has plans this weekend or something to do on Sunday, and i've tried trying to talk to people I know, by texting or messaging and saying that i could really use someone to talk to, but since Thursday, when i went to the VA and started trying to find someone to talk to, no one at all has responded to me, and that just really really hurts. I feel like I dont matter as a human being and like I have no life, and I'll probably never have a life bc i'm 37 now and in a few short years I'll have to start keeping in mind that it will get less likely ill get to have children, and I'm just really sad and upset about all of this. also, everywhere i go there are things advertising mother's day, even on TV, or they advertize something related to babies and motherhood, and it just breaks my heart and i want to start crying bc I'm afraid I'll never find someone that wants to be with me and stay with me, and that also wants children or more children.