How can I be more socialable?

Hi I'm 17 and in high-school. I am a very bright, bubbly, sweet, cute girl. I am usually never mean and I will talk to anyone, I'm not a big person to judge. I laugh and respect people as best as I can. I don't blow people off, I am a good friend, and I'm in no drama at all. I have had 3 jobs, I volunteer at a day care, and I flirt with guys a lot (like any normal teenage girl ha). My problem is; no one wants to be my friend. I sit at home alone everyday, all day. I sometimes sit in the library at lunch cause I don't have people to sit by. Half of my friends live in towns 15-20 minutes away, and more guys talk to me than girls. Yes I want a boyfriend but I rather have a best friend that I do everything with. I have done sports, clubs, and even tried hanging/talking to new people. No one wants to talk to me. What should I do? I'm starting to get depressed about this. The only thing that I keep telling myself is that this is JUST high-school. But I do want to have fun when I'm young. Please any comments/suggestions will help. Thanks to everyone who comments.