Help with getting over shyness!!!?

I think i'm okay at it but i'm really shy. I've been singing to myself for as long as i can remember, and i'm really outgoing except when it comes to singing. Never sung in front of family or friends because i'm just too shy. I also write my own songs and if someone found them i'd be mortified. So if anyone went through the same thing, then please help me because i wanna share my voice with people. I'm 13 years old so please help!