I also suck at growing spearmint. Which, yes, is also a weed. I do fine growing catnip -- also a mint, but a less hardy one -- inside a house occupied by four cats. But spearmint won't even grow to the point that it has leaves on it.
I seem to be able to grow more difficult things just fine. I got a ton of giant delicious tomatoes this year while most people's didn't produce anything. Also cantaloupes, eggplants, tons of huge zucchinis, and a bunch of other herbs and veggies.
Why do chives hate me?