Asexualitydoesn’t mean you must’ve been born with less hormones or that you are picky and heartless. It doesn’t mean you can’t feel pleasure from sex.
Being asexual does not mean you condemn people who have sex. It doesn’t mean you can’t have sexual drive or that you can’t masturbate.
Identifying yourself as asexual should not be seen as a barrier that will stop you from having partners. You may have sexual intimacy sometimes, or it just won’t happen. Whatever makes you feel comfortable in that relationship.
You can become asexual because of experience, just as much as you can become one because you thought you fit in. You may even not find yourself fitting anymore later in life.