Is it normal that i always feel like crying?

I constantly feel like crying, and I never smile. Even when I talk to my family (mum dad and sister, and also my brother when he phones or visits) I love my family but I feel bad because when they talk to me I just feel like crying and feel sad all the time which makes it hard to talk or answer anything other than just saying a yes or no in response, or a simple "mm." There's so much I wish I could say to SOMEONE, but I just can't. I never have anything positive to say, unless it's about some small thing like a picture I drew, a story I wrote, or something completely made up like a scenario I made in my head. And don't get me started on when I try to talk about my feelings and what upsets me to anyone, I break down crying which makes it impossible to explain it or talk about it. It's just I'm lonely and I know there's nothing anyone can do to change it, because of some "reasons" which I will not list. It's hard for me to crack a smile. The only person I really talk at length to about anything is my younger sister (who's 15). I also have a lot of intrusive thoughts worrying about the future and thinking about my parents getting old and dying or something bad happening to my family, and how I wish I could say I love them but not knowing how because that would be awkward to just bring up for no reason or whatever. I just feel sad all the time, for different reasons. Mainly the loneliness and yearning for a young male companion. Am I depressed?