There could be a number of reasons. I found that taking 5 units of my slow release insulin (levimer for me, could be Lantis) stops my sugars rising just before dinner in the winter (don't need it in the summer). My diabetic nurse got me to try it because I always went high at the same time, so she thought I was running out of background insulin.
Disclaimer, if you do try and change your insulin in any way, check your sugars regularly so you don't go low.
Stress causes my sugars to raise. You say you are 16. Are you doing exams? That might be adding to it.
You said you have increased your insulin. What type did you increase? If you are going high before food, increasing your quick acting wont help much.
Basically, there is always a reason for sugars going up, but it's not always your fault.
What I would suggest if for the next two weeks write down everything. What you ate, what excercise you did, how stressed you felt, and what your sugar reading was. When I did this, I recorded it on a sheet with columns of time, reading, food, insulin, activity and stress levels. That's when you start to see the patterns.
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