Why do most people never get to see or hear Angels?

I saw my Angel when I was 11 years old.  Since then I have felt her and heard her speak to me.  I'm now in my late 20's.  My Angel "Marie" has been a Godsend.  She has comforted me and lifted me to more positive thinking in bad times.  She has continued to relay the message that God loves me.  She has said that she will always be with me on this Earth watching over me. 

Angels are always around us whether we see, hear, or feel them.  Many people have claimed to see Angels.  I'm also quite sure there are people that can feel their presence and hear them.  One of which seems to be a woman named Doreen Virtue.  She has done many youtube videos on Angels.
Here is a video called Meet your Guardian Angels, Doreen Virtue:
http://www.youtube.com/watch?v=IfHBUEEMf1E&feature=related

Please know that you may not see or hear your Guardian Angel while you live on this Earth. This does not mean you don't have one. Angels have to give their consent for you to see them in their "Angel" form.  They are not from this world and may wish to be unseen in their "Angel" form. What I mean is that Angels may show themselves to you in other ways.  They may also show themselves to you in Human form as to not scare you.  Everyone on this Earth has at least 1 Guardian Angel if not more.  Pray to God and ask him to send you a sign that your Guradian Angel is with you.  Remember that you shouldn't pray to Angels.  Ask God for his assistance in calling on your Angel.  Angels give all kinds of signs that they are with us.  They perform small miracles for us everyday.  When you pay attention to this you will start noticing them more and more.  Just because you can't see or hear Angels does not mean you are not special to God and the Angels.  This only means that you are not ready to experience this yet.  In your existence you will see or hear Angels.  God does not want us to worship Angels.  This is one of the reasons that maybe a lot of people do not see Angels.  At our fallen state on Earth we might see an Angel and start praying to it instead of God.  Also, some people may be afraid if they were to hear voices in their heads and not know where they were coming from.  This may be another reason why people do not hear Angels.  The biggest reason that people do not see, feel, or hear Angels is due to fear or not believing in them!