That describes me. I have not engaged in sex for years, and I am perfectly fine not connecting with someone else in such a manner. Sex is not an important to me. Is there anyone else like that? I bring this up mainly because I have a question about masturbation. Does self gratification in any way negate asexuality or does one need to physically connect with another person for the asexuality to be considered null?
Asexuality can be lack of sexual attraction to others or the lack of interest in sex. So, while technically you could call yourself asexual masturbation kinda is a cheat here.
It's not uncommon for people who identify as asexual to indulge in masturbation. Some don't consider the act to be sexual, but rather a form of 'body maintenance.' Considering that asexuality is just another form of sexual orientation, like hetero or bi, it all boils down to sexual attraction. Also, it should go without saying that sexual orientation refers to preference and not behavior. Obviously, it's possible for asexual people to engage in sex just like it's possible that a gay man could have sex with a woman. So no, your asexuality is not null because you masturbate.