Congrats but $100 for one year is considered really poor with Adsense. There are people here who regularly make over $5 to $10 daily just from one website. My advice to you is don't let this discourage you, just keep learning and maybe also consider switching to a more lucrative niche where the payout per Adsense click is higher. Good luck.
Congrats for your 1st payment...!! One day your earnings will be $100/day...just don't loose hope and keep on going..!! Best of Luck