LPN to new grad RN pay

[K8TRN, RN]

I recently graduated with my RN in May and started a job at a children's hospital in CT in August.  I was an LPN for 12 years before I graduated.  I worked in LTC, homecare, a doctors office, psych unit and most recently, detox.  I live in CT and have worked in MA my entire LPN career because I could never find an LPN job in CT.  When I got my RN, my pay at the detox went up to $40/hour and I am still per diem there and pick up shifts occasionally.  I was offered $34/hour at the hospital as a new grad.  I didn't even think of negotiating my pay because the HR recruiter was so rude and kept asking me if I "really wanted the job" and "really wanted me to think about if this was where I wanted to work" and completely discredited the fact that I had experience and was an LPN.  I'm float pool so once I'm off orientation my pay will go up to $37/hour with the differential.  And overall the differentials are more at the hospital compared to the detox.  While I absolutely LOVE my new job and being able to perform so many more skills that I would never do in detox, I am really regretting not negotiating my pay.  Hospitals overall pay less compared to behavioral health and the detox just underwent a major pay increase as a whole for retention.  Was I a complete idiot for taking this job without negotiating pay?  I felt as a "new grad" I shouldn't be picky about the pay because eventually I will be making more as an RN.  Once I am off orientation I can start picking up shifts for crucial staffing pay and they do pay an extra $120-150/ hour on top of base pay, OT, differentials, etc.  but I still feel stupid for not standing up for myself.