Why am i still very hungry after eating oatmeal of all foods?

I'm so confused because I read and heard from others that oatmeal is a very filing food and keeps you full for a long while. Well it doesn't for me. This morning I had a MASSIVE bowl of oatmeal (not the instant kind but actual quick oats i bought from my local farmers market and cooked for 15 minutes). In addition to that giant bowl of oatmeal i also had like 5 huge handfuls of dry cereal, like 10 unsalted mini pretzels, and like 3 tablespoons of cottage cheese. And to wash that all down i had a hot cup of green tea, and after all that i was still hungry for more food. If it helps at all i'm a male, going to be 19 in August, i'm 5'5" and 121 pounds with like 9% body fat. I work out/exercise 6-7 days a week which includes minimum of 40 minutes of running on the treadmill and an hour of lifting weights.