I am so sorry to hear about the loss of your friend Brittany. I know that right now the world must seem like a horrible place to be, but please know that this is a normal feeling right after losing someone.
If you are having a really hard time dealing with her loss, may I kindly suggest that you contact a hospice organization and see if you can join a grief support group? I'm sure there must be a hospice organization on the Cape. When my Mom died, the local hospice (in Norwood) was very helpful. I went to a grief support group for about two months (once a week), until I felt like I could handle it on my own.
Losing a person you care for is hard at any age, but it must be especially difficult at your age, and losing someone who should have been with you for many years to come. My heart goes out to you.