With advance scammers and viruses do i need a Security system on my MAC

Additional NO info: there is no reason to ever install or run any 3rd party "cleaning", "optimizing", "speed-up", anti-virus, VPN or security apps on your Mac.  This documents describe what you need to know and do in order to protect your Mac: Effective defenses against malware and other threats - Apple Community and Recognize and avoid phishing messages, phony support calls, and other scams - Apple Support.  

There are no known viruses, i.e. self propagating, for Macs.  There are, however, adware and malware which require the user to install although unwittingly most of the time thru sneaky links, etc.   

Anti Virus developers try to group all types as viruses into their ad campaigns of fear.  They do a poor job of the detecting and isolating the adware and malware.  Since there are no viruses these apps use up a lot of system resources searching for what is non-existent and adversely affect system and app performance.

There is one app, Malwarebytes, which was developed by a long time contributor to these forums and a highly respected member of the computer security community, that is designed solely to seek out adware and known malware and remove it.  The free version is more than adequate for most users.  

Unless you're using a true VPN tunnel, such as between you and your employer's, school's or bank's servers, they provide false security from a privacy standpoint. 

Just some additional food for thought.

The absolute answer is NO. Third party software like anti-virus (McAfee, Norton, etc.) do more to screw up your computer than protect it. There are no viruses that can infect a Mac without user action. In other words you have to infect yourself by clicking on too-good-to-be-true offers and software promising magical abilities and performance. Downloading and installing pirated software will also snag you. The biggest threat to any Mac user lies between the ears of that Mac user.

You already have an advanced Security system on your Mac. There is nothing more advanced.