-For god's sakes, plan if you're going to submit it. Especially when you're writing horror, because you're going to inevitably start including your troubles there. And without planning, it comes out way too personal. It looks like the scribblings of a severely disturbed madwoman. And the magazine doesn't want that, because it's incoherent and frankly, quite shitty. Even if you think it sounds "good".
-Don't take rejections personally.
-Learn to love having your work torn to shreds.
-Writing is a life-sucking, draining passion; be wary of that.
-As troublesome, often painful, and confusing as it is, it is a passion, and you can keep going.
-Never ******** give up. Never.