Having your tonsils removed is considered to be a fairly minor procedure, no matter when you decide to have it done. At your age, you are unlikely to have major risk factor such as heart disease and lung disease that would make you a bad candidate for the surgery. I can't comment on whether it will be more painful. In any case, you will be provided with pain medication if necessary. Whether or not it would be worth it to have the procedure done is another matter entirely. Tonsillitis in adults is certainly less common than it is in kids. This accounts for why the procedure is done more commonly in kids than in adults. Nevertheless, if you need it, then you should get it done.
I suggest that you schedule an appointment with an ear, nose, and throat doctors
">doctor. This is the type of doctor that evaluates people that have had recurrent bouts of tonsillitis. Ear nose and throat doctors are also able to perform the needed operations such as a tonsillectomy (having your tonsillitis removed). After a review of your previous infection history and a thorough physical exam, the ear nose and throat specialist
will know what the best route of treatment is best for you. Good luck.