Hi :)
I've also just gotten a new tattoo and am completely new to tattoos in general so am quite ignorant, however this is what one of my tattooed friend told me before I got mine: regret is part of the journey. There are always going to be moments when you feel like "oh shit, what have I done" but just embrace it and move on. I personally think it's F***ing cool that you went out and got yourself tattooed: it's brave, it's unique and it's an experience.
Worst case scenario you can always have it removed, but if I were you I would enjoy it for the time being :)