Do i have a female phobia??!?

Ever since I was like 12 years old I have been really nervous around girls. I don't know why, but I always have nothing to say and I feel really awkward when I'm around girls. I feel like its almost unnatural how nervous I get around girls because you would think as i get older the fear would wear off but im 18 and I still feel the same fear as I did when I was 12? What can I do to stop this?