Losing everyone

For a while now I've felt like I've lost everyone, like I have no one. My depression has came back and it's hard. I feel like I only have my boyfriend and I never cry Infront of him but the other night he mentioned something about my birthday coming up  (which I'm upset about because it's my 16th and I was finally allowed to have a party but I have no one so I'm not having one anymore) and I cried for 2 hours, I tried to keep as silent as possible and he fell asleep, he didn't know but it's getting to the point where I cry myself to sleep at least 2-3 times a week because I have no one. I've lost all my best friends. I had about 5 really close friends who helped me through trough times and they're gone and I don't know what do to