Sorry, mate, it's not that easy. For one, there are endorsement and influence requirements (300 endorsements and 109,500 SPDR, minimum), and you're not even in the World Assembly, and for two, the other Security Councillors need to accept you, and they won't if they don't have a reason to completely trust you with the security of TNP. Your real life position as a security guard has little to nothing to do with that.
Edit: Technically, they don't need to accept you for you to join, but without the endorsement of the majority of its members, you're incredibly unlikely to get in.