What are some ways to find fulfillment and happiness while being single, especially if you're not religious?

Sometimes I have really amazing ideas but I am never motivated to start and eventually never do it at all. I'm naturally a lazy person and I don't really like putting effort into things. How do I overcome this?
Are there any cases of people that avoided certain death only because they had acted irrationally without any intention to avoid the danger and the knowledge of the danger?