Sounds like you're getting a big case of NRE. (new relationship energy) I recommend doing a search here, for NRE. You'll find lots of threads about it.
All you need to remember when you get panicky, is to breathe. You might turn out to be mono. It's not a bad thing, it's a useful thing to know. I thought I was mono, once. I am bisexual, and I knew it as soon as I learned that girls could date girls ('you mean...*gasp*...girls an option? HOOray!'). I never intentionally sought out poly, but I've been open the two times in my life it's presented itself. First time didn't work so well (I recall getting a black eye from that venture). This time seems to be going great.
Welcome to this little forum. I suspect you're in the right place.
Love is that condition in which the happiness of another person is essential to your own...
Robert A. Heinlein
Me: female, bi, (formerly hinge of a vee)
with FirstBoyFriend (FBF)(moderately long-distance)
and no longer with CurrentBoyFriend (CBF)(who lives in the apartment building next door)