I am not sure if we do have a guardian angel but I believe there is a higher being watching over us making sure that we are OK but then you have to ask yourself if that the case Why does bad things happened to good people
Guardian angels are not biblical. But God does say he knows the plans he has for you and they're plans for your good, He also says that he will protect those who call on him, maybe he does protect is with angels, i don't know, but he does protect us and that's the important thing :)
I believe we all have guardian angels to watch over and protect us from harm. They will help us in our time of need but usually we sense them and usually don't see them unless it will in some way be beneficial for us to see them, for example if we still doubt that they exist or maybe we are meant to see and feel their presence so we will be able to tell others that doubt their existence. God has plans for all of us and our guardian angels are guiding us to fulfill God's plans for each of us.
Angels are sent by God for a particular purpose or mission to serve and minister to the believers on an as needed basis. (Psalms 91:11) Angels are spirits, without bodies, yet they can assume bodies and appear in them when God pleases. Sometimes it is possible that we have entertained angels without being aware of it. (Hebrews 13:2) Be careful how you treat other children of God, they have guardian angels too. (Matthew 18:10) God sends angels to care for us, as we need it, because He loves us and we believe in Him. Believers always have God's help when they need it.