Kissing My Girlfriend?

So Im 15 and me and my girlfriend have been dating for 2 and a half weeks and i want to kiss her. We are going to hang out tomorrow at her house and i think i should do it. It only took 1 day for me and my ex to kiss and blah blah, but my new gf is like innocent and is like joyful lol..But we really like each other and i want to do it but her being really inocent makes me think that there might be an akward moment after. But i really want to but should i? Im a really confident guy but i respect people thats why lol