Asexuality is a sexual orientation. It’s not something you can switch on or off on a whim, asexuality is not a choice. Most asexual people will tell you that they’ve always been this way and that they’ve never known anything different. You can’t become asexual anymore than you can turn yourself gay or straight. Certainly, you can practice abstinence and choose to become celibate, but asexuality and celibacy are not the same thing.