I was diagnosed at almost 24 and that was 44 years ago. Had to boil syringes at first with big metal needles and only one injection a day on 24 hour insulin. How things have changed for the better with easy blood glucose testing such as Freestyle Libre. All I can say is do your best and just...
I have never checked mine either during 43 years type 1. Have a little bit of neuropathy in one foot but the rest of me is ok. Do try hard to keep good bs levels but not always successful and still on syringes rather than pump.