How do I tell if I'm asexual?

How would one go about determining if they are asexual? Are there any particular signs or feelings that one should look out for? Is there a test or assessment that can help confirm one's asexuality? Additionally, what is the difference between being asexual and simply not being sexually attracted to someone at the moment? Understanding one's sexual orientation can be a complex process, so any insight or guidance would be greatly appreciated.