Heya, the spectrum for asexuality is a pretty wide and varying one, so you can definitely identify as asexual while still getting urges. I have zero sexual interest in people but still get urges to masturbate, sometimes with visuals. Mine goes even further to where I'm not really romantically interested in people either but still might not mind a platonic life partner someday. We come in all shapes and sizes.

Of course, there really is a possibility that some of your lack of desire stems from mood/anxiety issues but I wouldn't let anyone tell you there's no such thing as asexuality. I did for years - including to myself - and have only recently started understanding that part of me (remember - whatever your sexuality, it's just a small part of you).

If you haven't seen it, check out this site, its wiki/glossary and forums: The Asexual Visibility and Education Network | asexuality.org . I'm not affiliated with it but found it extremely helpful when I was questioning myself.