ABSOLUTELY. I had the same question when I was going into Tae Kwon Do. It's so fun and I'm addicted. I go to high school, so I put any bullies that come to me in their place. You'll feel confident and you'll have more friends and fun. Be dedicated and you'll be great at it, I promise.
Don't be scared about how they'll treat or your physical features. It will help you stay in shape and increase flexibility.
My Answer: Go for it.