Eat Much sugar, but low blood sugar?

Every 2 hours I have a can of non diet pepsi. I am 15. I am 5 feet 5 inches, 140 pounds.
I was able to test my Blood sugar, it said 77 , about 30 minutes after soda. 3 hours later, after a steak, mashed potatos, and another can. I tested it about 30 minutes after, it said 75. I can se 2 differnt testers, I did both said 75, 76. what could be wrong? I don think thats normal.
Also if I feel misrable, and I test it, it will be lower! like 70. and then i eat liek a bannana or even a soda and it goes up to about 75 80
You need to have your mom or someone make an appointment for you to get checked out. Sounds like something's not right.

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