The process of coming to terms with one's sexuality varies widely, depending on the individual — it can be scary, invigorating, heartbreaking, life-affirming; usually it's some complex combination of those feelings and more. What does not vary in the process of coming out is the fact that it is a process. It has a timeline, and not necessarily a smooth one. It's marked by fits and starts, denials and avowals, fraught conversations in somebody's car, the fear of rejection and, hopefully, the relief of acceptance.
Which is probably why we keep making movies about it.