Hey there, and
We have a ton of forums you may want to look into, including the 20-Somethings (for those in that age range) and our Weight Watchers forums, if that's the plan you're following.
As for snacking, is there a reason you don't want to snack? I can't stay on track WITHOUT snacking...if I get too hungry between meals, I end up overeating at the next meal and take in more calories than if I'd just had a snack. Snacks become a problem when you're eating unhealthy snack items, or when you're consuming too many calories in snacks compared to what you burn. There is nothing wrong with "snacks" in and of themselves, you just need to a) keep track of them in your daily points/calories/etc totals and b) make healthy snack choices (fruits, veggies, whole grains including crackers and popcorn, maybe a cheese stick...snacks can be tasty and healthy).
If you do really want to cut them out, but you're still hungry in between meals, you may not be eating enough at the actual mealtime to get you through to the next meal. Also, I'd make sure you're well hydrated. Sometimes thirst can feel a lot like hunger.