Hi Paige @paigedawes and a big welcome to this site; I see you just joined a couple of hours ago.
A possible way you could meet other teens, in addition to meeting some on here, is to attend if possible a TypeOneNation Summit - I was at one last week and I saw with and talked with several young people. In addition to the Summits, JDRF has local chapters, sponsors walks where lots of teens participate. You may be able to find contacts in your are by clicking on the “Events” tab at the top of this page - events and groups and lots of other stuff can be found easily.
I attend a monthly JDRF “Cups of Hope” coffee - about half of the people attending are parents / families of teens who have T1D - the contact person in your area could probably put you in touch with other teens like yourself.