You ask, "Do I have a Guardian Angel..?", and the answer is, only if someone (even you) has prayed for your protection in some way.
Many believe that the Angles must be invited to watch over you, and those same people know that God has told the Angles to bow to Man.
Here is some interesting reading for you,
Guardian angel ~From Wikipedia, the free encyclopedia
The belief that God sends a spirit to watch every individual was common in Ancient Greek philosophy, and was alluded to by Plato in Phaedo, 108. The idea appears in the Old Testament, although it is not specifically articulated nor delineated. The belief that angels can be guides and intercessors for men can be found in Job 33:23-6, and in the Book of Daniel (specifically Daniel 10:13) angels seem to be assigned to certain countries. In this latter case the “prince of the Persian kingdom” was referring to one of the fallen angels also known to many as a demon. The same verse mentions “Michael, one of the chief princes,” and Michael is one of the few angels named in the Bible. In the New Testament Book of Jude Michael is described as an archangel. The Book of Enoch, part of the Ethiopian Orthodox Tewahedo Church's canon of scripture, says that God will "set a guard of holy angels over all the righteous" (1En 100:5).
This is the traditional Catholic prayer to one's guardian angel.
Angel of God, my guardian dear
to whom God's love commits me here.
Ever this day/night be at my side
to light, to guard, to rule and guide.
qui custos es mei,
me, tibi commissum pietate superna,
rege et guberna.
An Eastern Orthodox prayer to the Guardian Angel:
O Angel of Christ, my holy Guardian and Protector of my soul and body, forgive me all my sins of today. Deliver me from all the wiles of the enemy, that I may not anger my God by any sin. Pray for me, sinful and unworthy servant, that thou mayest present me worthy of the kindness and mercy of the All-holy Trinity and the Mother of my Lord Jesus Christ, and of all the Saints. Amen.