Depression - Little Social Activity?

As I came back from Spain I noticed that I might hve slight depression, I'm always tired, kinda blue. The reason for all of this is because in my neighborhood I once got into a large argument with a kid (mutual hate - irreversible), and a girl that lives close to me got into an argument with my cousin long ago 8 years, and I still haven't done anything with her. These people have connections with all of the kids in my neighborhood =\. Now I'm 15, so I don't have a car yet so people outside of my neighborhood is tough to hang out with. I'm fairly sociable in high school, I might have slight anxiety, but I overcome it. I find the problem with me is actually getting a person's phone number, calling them, asking them to hang out. I for some reason am afraid of doing this..I sadly like to blame this kind of thing on my parents, because all they ever talk about is their work and how much they hate it, so I never learned to communicate well.. and they crowded me with family frnds?
Suggestion?

I'm not sure if you understand. I talk with a lot of people and it's not just small talk, etc. It's just when I'm not in touch with them I can't maintain a relationship kind of thing

I can see how this is hard for you.
You just have to force yourself to take one step, then the next, and so on. Decide what there is for you to see, do, get involved in: whatever activity you can to reach out and create a social circle for yourself.
Can you get a part time job? Do volunteer work?
When the time comes to speak to someone, just say what you've pictured in your mind...even something direct and to the point is fine ("you wanna' hang out/go to the movies sometime?" "you want to go somewhere sometime?"). You may well be helping the other person out, if they're even half as shy as yourself.
Remember how hard a baby chick works to poke out of its shell? The effort for humans of all ages is difficult as well, when trying to push against our limitations or boundaries.
But its done all the time, and you can do it, too.
Best wishes.

well first and foremost this feeling is common among teens believe it or not. I suggest you get over the "childish" arguments and go over and talk to the neighbors but that's only if u want to. Maybe the neighborhood kids aren't the types you should hang out with , and that's cool. You say you don't have a car then ask a friend to pick you up, if your house is to far then ask your parent to drive to his/her job and get picked up there and that's just an example but get a ride to a location a little closer and have a friend scoop you up!! Now you say you are nervous to approach people to hang out , that's totally normal but practice makes perfect. Practice by asking strangers for the time and it'll ease the anxiety after a while. It'll make you feel comfortable talking to people outside of family friends. Don't underestimate your family friends, they could be cool to hang out with once you guys get to a different setting, that's something to think about too. Anyway, good luck !!!!