You are eating terribly light, and I think calling it 4 meals is an exaggeration. A single banana is not a meal. I hope that the mid-day salad is one of those jumbo salads with lots of toppings.
Also, you need to get some hearty oats and make your porridge from scratch. Oatmeal packets are not going to cut it nutrition-wise.
When and if you lean out you are going to look like a skinny-fat guy if you are not careful.
Your meals need more protein, more fat, and there need to be more meals if possible. Read some articles here on pre and post workout nutrition. Look at some diets and choose one that suits your tastes, your body chemistry, and your goals.
Make sure that diet is either a flexible long-term diet that can be used for bulking, cutting and maintaining (Anabolic Diet, T-Dawg Diet, Dr. Berardi's nutritional guidelines, etc) or plan in advance what you are going to transition to once you are maintaining and/or bulking next.