I thought of another analogy to help you to better understand and appreciate the presence of your guardian angel, even though you cannot sense them or dialogue with them as you can with God.
Imagine if every single human birth always took place as twins. So you, each of your parents, your grandparents, your neighbors, your friends, your co-workers, the President of the USA, absolutely everyone who had ever been born had a real twin.
And then imagine if one day one twin from every pair dropped dead (so the earth's population would suddenly be halved) and your twin died, your mom's twin died, your dad's twin died, each and every person you know or saw had their twin die. If you can imagine how bereft and agonizing that would be, that is the best human oriented analogy I can think of regarding how it would feel if there were no guardian angels. The sudden feeling of "your other half" being gone and everyone feeling and experiencing the same thing would expose a silence that would be unbearably painful.
Therefore, it helps you to think of guardian angels as individually and collectively providing an unintelligible but very real background "white noise" that even though unappreciated does protect every human-even one who is not a believer and is very distant from God-from actually feeling what it would be like to have no sense of God in your life or in the world at all.
So the guardian angels provide a connectivity to the reality to God that is like a constant white noise that one is totally unaware of, but would find unbearable if it were suddenly gone. That is why I thought of that every person having a twin analogy where everyone at once would lose their twin. Notice I am careful to make the analogy so that it's not "soul mate" or other romantic twin. A guardian angel is like a constant open line to God, even if you don't believe in God and even if you do not realize you have the line. But subliminally you hear that there is an inviting open line always open, so you are never really "alone." This is why the worldwide every person twin dropping dead analogy works fairly well for this analogy, because it would be as if each person's "other half who knows me best of all and is always there for me, and has been with me from the womb" open phone line to God suddenly went dead. (That's not to say, of course, that guardian angels are necessary for you to pray to God or to dialogue with him. I'm just describing what it would feel like if there were no guardian angels using these analogies). Many twins who have lost their twin to illness or accident can tell you what that feeling is like. So you can extend that understanding to imagining if what if everyone experienced and felt that loss simultaneously, and thus imagine what a world without guardian angels would be like. Again, I'm not saying that angels are anything like humans so they are not your "twin." This is only an analogy in order to invoke in a human reader the closest human equivalent sensation of what it would feel like if guardian angels did not exist for humans at all.
So guardian angels provide a very important contribution to not only one feeling reinforcement of one's faith and of God's love for you, but they also provide what could be described as without exaggeration, an important balance and emotional stability. I cannot even describe to you how erratic and demented people would behave if they had the emptiness of NOT having a guardian angel. Without guardian angels there would be a rather nihilistic silence that it would take incredible faith and balance to fight against. So God's conception gift to each human (and thus to humanity as a whole) is a guardian angel. They provide a real connectivity of white noise openness that humans don't feel but would find unbearable if it were suddenly not there! But you don't have to worry, since God will always provide.
I do have to give one caution. As you know, humanity is grappling with some severe ethics challenges, with cloning, stem cell research, animal and human combination cells and "donor children" being recent examples. Those of you with any responsibility in these areas (and the public at large) must remember that God will not allow humanity to manipulate itself into inhumanity. Do not be complacent in your assumptions about what lines God will draw regarding souls and guardian angels to a newly formed human being. Be very careful about assuming you know what he will do if you push it too far. God can do MANY things more than you can imagine, and I guarantee that if you push the boundaries and worse, assume that "no soul or angel is present" or that there "is a soul or angel present and all mighty you is manipulating it" that humanity (to say nothing of your own soul) will be in trouble, big trouble, like you cannot even imagine. Trust me on this; you don't want to find out how right I am on this point.