With today's bows and sights this should not be a problem, but it does crop up once in a while. In almost all cases it is because the shooter (you) are anchoring too high. You didn't give much detail, but in most cases, if you are using peep sight then it should be about 5 1/2" to 6" above the nocking point. Moving it up to this point will force you to anchor lower. In this case if you are using anchor referrences such as touching the tip of your nose to the string you may have to change the draw length to do so.
I suggest you post more specific info such as the bow's draw length, draw weight, the arows you are shooting. Also have you been measured for what drawlength would fit you best? How high is your peep now and kisser button if you are using one? Better yet would be a picture from the side of you at full draw, head to foot so we can see how the bow fits you.
I could write a book explaining more, but being you're new I don't want to clutter your mind at this point.
If You're Not Living on the Edge You're Taking Up Too Much Space
Martin/Rytera Staff Shooter
PSAA Life member, UBP Life member
PADI AOW Diver