I would definitely have it done - it's such a shame that your parents didn't arrange for you to have corrective surgery when you were a child as it would have saved you years of self-consciousness, avoiding the camera and so on. I don't think it's just vanity, it's about self esteem and self confidence too.
My DD had the surgery at three and a half, and she recovered very quickly. When I was in my teens I had a friend with a very bad squint. Her parents had been too frightened to let her have the surgery when she was young, but as soon as she was able to make her own decision at 16, she had it done. She was a very pretty girl, I remember, and I always thought it so sad that her parents had withheld their consent, putting her through years of taunting at school, which could have been avoided.
I wish you all the best - and afterwards, treat yourself to a beautiful outfit and book a photo shoot with a professional photographer!