Help with pale sickly looking lips

I am so so bad at make up. But I am trying to learn an decent everyday make up. I have big eyes with long lashes and like to accentuate them with a little eyeshadow and mascara. For my skin I focus on getting it healthier with the goal of making it look okayish without foundation. But I really struggle with my lips. I have a tiny mouth with an even tinier upper lip in a very pale colour and not clear defined borders. I don’t like my teeth so I don’t want to put focus on my lips, but I think doing nothing with them makes me look sick. How do I find the right colour or products to achieve natural look? I feel like most pinks are too “Barbie” and red often is too much. Would a lipliner help? How do I use one without looking like using a sharpie?