Should I have a Will?

I've been thinking about this alot since I came out of the hospital this last time. I've had 4 suicide attempts so far. Sometimes I wonder if I will make it to 30. I dont really have money but I have a few material possessions. Mostly I am thinking about what they should do with my body. I've been thinking about it for awhile. This is what I want: I dont want a funeral. I want to be cremated. This will be a big issue with my family. I have a huge family. They tend to make a big deal about how things should be done. I dont want the talk(whats that called?) to be at a funeral home. I want it to be at church. Or if that cant be arranged then it should be at a family members house Then I want my ashes to be scattered in St. Augustine. That is where we went for our 4th anniversary. It was the last time that I was actually happy. Is it weird that have I these wishes?