Fellow Christians: Do you have difficulty with belief in angels?

As a Christian, my understanding is that there is a God, three persons in one, and that Christ is God in human form, now resurrected and ascended. I can also see what seems to be the organised activity of the Devil in the world. However, despite what the Bible appears to say on the subject, i have to admit i have a problem with the idea of other angels than Satan because it seems that to believe in other supernatural entities is a little like being polytheistic or henotheistic rather than monotheist. Does anyone else have the same problem? I know they're not supposed to be worshipped, but it's really hard for me to accept their existence at all.