Welcome to our forum.
Have a look around, there is a lot perspectives and insights to draw from here and it will help you work through this difficult emotional process. I think that mostly this is something you'll have to endure for awhile as it won't get easier overnight. From what you're saying things have only "been poly" for a few months, whereas it can take a few years at least. I don't mean to discourage you, I just mean that you need not think you're doing something wrong if your feelings don't settle right away.
Polyamory's not for everyone but you seem to have a sincere desire to try and adapt to it. Just don't totally shut the door on monogamy in case you need an out.
Please keep us posted and let us know how things are coming along.
Glad to have you onboard.
Love means never having to say, "Put down that meat cleaver!"