What are some healthy substitutes for these desserts that I love?

I’m positive I have some sort of sugar addiction and I need to kick the habit- badly. I don’t enjoy super sweet stuff (sodas, fruit flavored candy, even some fruit juice) but I absolutely love rich stuff. If that makes any sense.

The particular things I need help kicking are cookies, cakes, pastries, pies, chocolate, ice cream, etc.

Are there healthier recipe alternatives (or tricks to curb my cravings) to these desserts? Also, fruit is yummy, so I’m open to its inclusion, but it alone just doesn’t do the trick when I want a big piece of chocolate cake.