I am trying really hard too, it’s been running high for a long time also, little bit of me being scared to have the right insulin, I am petrified of going low! I’m dealing with this now and with a better background in place things are starting to improve!
Great that things are starting to improve but I think it might help you to try and work on your hypo fear. Failing that, talk to your clinic and see if you can get a cgm prescribed so that you get warnings of hypos.
As a T1 for 51 years, I had only a couple of hypos in my childhood pre-glucometer years, but I spent a lot of my teenage years running very high (I was thirsty) and only got control when I was given a glucometer in my early 20s. At that point I got hypos, but was hypo aware, so I just treated them and went on with life. Unless you're driving a car at the time, a hypo is very unlikely to kill you or be more than an inconvenience. So,
always carry glucose and do a blood test before you drive. Most T1s get hypos and we learn to live with them.
If you're not hypo aware then push strongly for access to a cgm with alarms, you need them. (And there are ways to regain hypo awareness if you've lost it, speaking from personal experience).
I agree with
@Seacrow that running at 20 is dangerous and doing your body no favours. Short term, we all have bad periods when we get ill, something weird happens and we just can't get our bgs right, but long term at 20 you need to ask your diabetic team for help.
Lots of virtual hugs, it's never too late to improve your diabetic control.