Is it possible to finish my attic?

I have a bungalow and i just recently crawled into the attic after 3 years of living in the house. I thought i will never use this for storage i wonder if i can finish this but i have 2 problems. First, There is a bunch of rafters going across the attic the ones that keep the roof from sagging. But the one i'm worried about is that the peak of the roof is about 9 inches above my head theres barely any headroom. That is definitely a problem because i would need a structural engineer to raise my roof. Is it still possible to finish it and still use it for other reasons?