If you really liked someone, would it matter to you how well they kissed?

Don't stress about it. I didn't get my first kiss until I was 19, and, like you, I was scared to death of kissing the girl I liked because she was older, and I was inexperienced. I never got the guts to do it, and I always regretted it. If it feels right, just go for it. It's really not as scary as it seems. Usually people will kiss you the way they want you to kiss them, so just follow her lead. The first time you kiss her, you don't want it to be too intense anyway. If you panic in the middle of it, just smile and look her in the eyes--she'll just think you're being cute and you can buy yourself a few seconds to calm down. Just try to relax. It'll come naturally!