Well, to tell the truth, I wasn't really ever afraid of loops. Before getting into coasters, I hated drops.
Loops are fun... To tell the truth, they feel like the track is curving up with (usually) quite a bit of g-force pushing you down into your seat until you're straight back up again. They don't feel like you're gonna fall out, if that's what you're worried about.
Corkscrews are a mixed bag... Some of them are like loops, with positive g-force... Others are taken slowly, and have "hangtime", which feels a lot like airtime but with a dizzying upside-down view.
Either way, they're not anything to be afraid. Just fun.