It Is Possible I Could Be A Guardian Angel?

I would say that you are most definitely a guardian angel, especially for the people that you have helped.  God intended for you to be there for them, and the fact that you cheated death at least four times means that God really needs you to be here, and you probably have at least one guardian angel looking out for you, too.

I don't think angel is the right word.  your karmic path, planned before you incarnated this time, probably included these people.  you have a connection with these people that began long before this life, in all likelihood.

God has a reason for letting you cheat death.  I am inclined to believe that each of us, at sometime  or another without us knowing it, is an angel that God sends to help somebody.  God works through people and He chooses who to send to help us.  For example, one night when I was on my way home from school, I realized that it has just rained and there are pools of water along the path where I will walk to get to the bus stop.  There was not a lot of light in that place.  Suddenly, out of the blue, a man dressed in white arrived and started to walk ahead of me towards the bus stop.  In effect, I could see where I should step so I can avoid the pools of water.  Then, he just "disappeared".  I think he must have been an angel sent to help me.  

That experience is the same as what happened when you helped others.  In my opinion, it is a nice to be thought of as an angel, but don't get obsessive about always helping others. Your first duty is to accept yourself and love yourself.  Live your life well and without you realizing it, you will have become the light for others.  

Guardian Angels have never been in human form they have always been angels. And help the person they are charged to see after, they help you in the right directions in your life. To stop you from bad decisions sometimes, to guide you with love and honesty. Hope this helps, good luck to you.

I truly believe that god leads people and God is the one who put you in the path of the others, he let you cheat death because it isn't your time to meet him just yet, you have other lives to touch as well.

Very doubtful...you are a human but hey only God knows!