Vocal teachers please help?

I have never gotten vocal lessons. I am really shy and I can't even sing in front of my family. Now i'm 13 and I like to sing, but alone. I get a sore throat every time I sing, am I doing something wrong? Also, I don't know if I'm any good. I can make my voice sound any way I want, but I can't sing loud. Can you just give me basic info/