Confused Feelings

me and this boy have been talking and hanging out nonstop for the last 6ish months, we both like each other and show that we do, we have talked about relationships about a month ago but at first we didnt jump into one, a month or so later (yesterday) we finally made things official but it dosent feel right now that we are together... its strange to me because i wanted this and now that its official it feels off... maybe its because i havent had a “boyfriend” before, maybe because i feel like things wont turn out, im not sure but whatever it is, its really putting a dent into how i feel for whatever reason.. my friends say its just because its the beginning and he’ll grow on me but im not too sure