Angela, yes, very hard to change, but I must say, it's easier to do when you're young. Here are a couple of my all-time favorite posts here on exactly this subject, with DOABLE, practical, detailed info on HOW to achieve your goals. The first isa prize winning tip from a member here who is now a psychologist or therapist
http://www.tudiabetes.org/group/simplestepsforhealth/forum/topics/start-small
The next is from someone coming from a low point in her diabetes journey, the community rallied, and gave her some wonderful advice.
https://forum.tudiabetes.org/topics/worst-diabetic-ever-needs-help
let us know how you're doing!