A few strategies that might help:
Take things one day at a time, or even one test / one injection / one meal at at time.
As you're probably still in honeymoon phase, your pancreas is probably still producing some insulin, at random intervals, making control more difficult than when it gives up completely. So, be gentle on yourself, rather than striving fir perfection.
Concentrate on doing the things that really matter to you and bring you joy. Especially if that involves physical activity and / or good food / drink, with good company. Avoid people who make you feel down or awkward.
Plan a treat for the near future eg a day out. Plan new experiences. Eg have you ever done a parkrun? Free 5km timed runs / jogs / walks in parks / open spaces / coastal areas at 9am (England and Wales) or 9.30am (Northern Ireland and Scotland) every Saturday morning (unless there's another event, festival, race etc in the park). Check
www.parkrun.org.uk for your nearest, then make sure you arrive about 10 minutes early, so you can hear the newbies' briefing (if there is one) or just ask anyone if they're a regular runner / walker / volunteer, for information.