Did I mess up?

I just recently picked this game up again, and Dances with Balrog's last quest completion gave me an unaccounted 300 EXP, meaning I became a Warrior at Level 11 instead of Level 10. Does this mean that I missed a whole level of Warrior stat growth and should restart my character, or did I not mess up and it doesn't matter when you become a Warrior?
Thanks for the help.

Edit: I think I did mess up after all, seeing as I only have 1 AP to distribute into my Warrior skills, when I should have 4. F*** me.

 

You miss out on 3 SP points, but those don't matter much in the end anyway.

 

I think it's quite a bit for a noob like me. I'm just gonna reroll my guy. Do you know the best way to powerlevel that 1-10? Should I just do all those Island quests again?

 

Yeah. Doing all the island quests and do the instructor quiz quest in Lith Harbor should get your exactly level 10.