Your post paints the picture of a horrible event that may have given rise to a civil claim against the three thugs that hurt you. That said, you will have difficulty finding an attorney to represent you because there is likely no recovery to be had from teenagers. You can try. Look for an attorney that specializes in intentional tort litigation.
Good luck to you.
In no way am I offering you legal advice, and in no way has my comment created an attorney-client relationship. You are not to rely upon my note above in any way, but insted need to sit down with counsel and share all relevant facts before receiving fully-informed legal advice. If you want to be completely sure of your rights, you must sit down with an experienced criminal defense attorney to be fully aware of your rights.
First off, I am sorry to hear about your unfortunate situation. You have a legal claim against these individuals, but if they don't have money or insurance, you will likely not collect a dime. That being said it is not worth your time or an attorney's time to sue these people.