Dexter77

OK. The first problem is your diet. Two meals per day are not enough. If you eat less, your body may react by slowing down your metabolism. Therefore, you should try eating 6-8 times a day. Smaller portions than before, but I would start with a proper breakfast (oatmeal, egg whites, some fruits are good examples). Then eat a healthy sandwitch later in the morning (whole grain + vegetables + lean meat). Lunch - e.g., grilled meat, whole grain or brown rice or potato and vegetables. Eat again in the afternoon - a healthy sandwitch like I described above. Supper vegetables with lean meat. Don't think you don't need to worry about your diet because you are 18. Everybody even kids should eat healthy because we know what is the result of unhealthy, high-fat/processed food/etc. diets.

Regarding your exercise routine: you should be more organized. Don't try to train each muscle group every time, but, instead, focus on certain bodyparts during each workout. For instance, day 1 chest and back, day 2 legs and calves, and day 3 arms and shoulders. You can train your abs every time you want. Allow at least two rest days for your body because recovery time is when development is made, i.e. not when you are in the gym. With regards to your cardio, try doing a 3-min warm-up, followed by 1 min normal-speed running/bike, then 30 sec faster running/bike, 1 min normal, 30 sec faster,..., and 2 min slow down in the end. If you are able to do 15 min, that's fine, later you will be running 20 min or even more.

Hope I could help you. If you have any questions...