Pregnant and extremely depressed..

So I’m 19 and I just found out a week ago that I’m pregnant. I’m single and definitely not looking for a relationship and I just enlisted into the army. Everyone around me is so excited and happy and fawning over me. I just can’t be happy or excited about it. All I’ve been able to do is cry and be upset. And any time someone tries to talk to me about baby stuff I get angry and snippy and I even made my doctor cry and I feel really bad about it, but I just don’t want to talk about it. I’ve tried to get happy about it and accept it but I just can’t. I don’t feel happy or any joy about it at all. Has anyone else felt like this? Or can someone give me some advice?