chengue, your muscles are still adapting to the demands you are putting on them by lifting weights. If you have followed a good workout routine, with lots of basic movements such as squats, rows, and presses, you are building a foundation of strength that will allow you to use more weight and begin to focus on specific muscle groups.
As you get stronger and begin lifting more weight your diet will become increasingly important. You should already be getting about 2 grams of protein per kilo of bodyweight. You should have eliminated or greatly reduced any sugar in your diet. You should be drinking a gallon of water per day. You should have calculated how many calories you need to maintain your current bodyweight and multiplied that number by 10% to get a range of the calories you will need to gain mass.
Are you getting enough protein everyday? Are you aware of your caloric needs?
In order for AAS to be of value you MUST have a solid workout foundation and your diet MUST be one of your top priorities, if not THE top priority, every single day. If these two very important aspects of training are not optimized before you even think of using sustanon or some other compound, you will end up worse off than if you had not taken anything. You could end up with gyno (bitch tits), severe acne scars, loss of hair, joint and tendon injuries, and worse.
Keep working out. Get your routine optimized. Make changes to you diet. You should not even consider using AAS at this time.
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