im sure you know that eating carbs will give you a quick boost of energy, and you should eat them before a workout, however im concerned if you are getting enough protein in your diet. every person needs the same amout of protein as their weight, so if you weigh 150 lbs you should try and eat 150 g of protein or more. I know that I used to fill not energized at all but when i started to eat more protein, and eat carbs before a workout, I felt better and more energized.

I hope this helps a little, Good luck!

Probably you need to eat more carbs.
Well, I said MORE..
I used to feel not so energized a couple days ago, then I ate one really big plate of pasta one night and the next day I felt much better.