My roommate thought she hated cooking and then she moved in with me and started using knives that were actually sharp and realized cooking is fun. Sometimes I wonder how many other situations are like this. It's not you, or your skills. It's just the lack of correct tools. Everyone knows you need a knife in the kitchen but no one mentions a sharpening stone.
Also you should probably sharpen your knife.
Speaking less metaphorically I literally do wonder how many people would realize Cooking Doesn't Suck if only they had sharper knives. Cutting vegetables is not supposed to be a workout. You're not supposed to apply force when you press down. If you have to force the knife down then the knife is dull! This is a fixable problem!