<human>: Can you condense the text into a few key points?

Ok some context:

She is a rarther nervous F17 who has never properly kissed a boy/girl. She has had some serve reactions in the past, including running and dumping her ex. When asked she blames herself, and isn't willing to go far from her comfort zone (Surface kissing). I get a feeling that this is part of a larger issue.

I am a M16 who hasn't much experience. My Ex had the same thing about sex, and our well meaning attempts to help simply degenerated into peer pressure. I don't feel confident in tackling the situation, let alone in escalating further. 

Our relationship mostly revolves around teasing and jokes, is this a problem? Do I need to act more mature and accepting or shall I try to push her to doing more? 

Any and all suggestions taken
<bot>: My girl wants to kiss more, but can't because of confidence or something like it, advice on what to do.