Why am i losing soooo slow?

So i been getting kind of upset about how my weight loss has been stagnant! idk why i feel like its going soooo slow!!! Ive been working out hard and eating good choices yet i feel like i should be losing more weight! idk... but i realized i lost 5% of my original starting weight which was one of my goals so i accomplished that!! Also, i feel like i been more tempted to cheat but haven't actually gone through with it... and don't plan on it! I keep comparing my weight loss to the last time and thinking how i was losing much faster and i just don't get it! but i need to just think of the positives and not the negatives.... at least I'm losing weight and getting farther away from 300lbs instead of closer or even pass it! I been also having trouble getting enough liquids in every day... any suggestions?