We sound so similar!! I am 27 and diagnosed with type 1 when I was 12. I went through a few years of totally not looking after myself (i.e. during my teenage years I just didn't want to face it anymore, then went to uni and completely ignored it). The worst thing is to be scared of this. That is not the way to get control - by only looking after yourself because you are worried of the complications. This will just freak you out (as it did me!). You can learn so much about diabetes but this is more than just knowing diabetes, it's about learning what your body responds to! There are a few posts that will be useful if you look back, especially the one about diatetes burn out. I also stopped injecting enough insulin because I was so scared of having a hypo (especially after I was taken to hospital in an ambulance - that really knocked my confidence) but we just have to get back on that horse, so to speak, and keep trying.
Keep coming back for support when you need to, and it sounds like you are being a lot more positive so that's great!!