There are a few sources of information to help you understand your developing body and what to expect during puberty. Here's a fact sheet from the Dept of Health to get you started: www.healthdirect.gov.au/article/girls-and-puberty. The library and bookshops have some helpful books on puberty too. You might like to try Kaz Cooke's 'The Puberty Book.' Your vagina is the hole between your urethra (where you wee from) and your anus (where you poo from). Orgasm is the term used for sexual climax. During orgasm, the vagina just contracts and relaxes but there are a whole lot of other chemicals released that add to the 'good feeling'. You have your whole life to have sex so don't rush into it too quickly. Make sure you are absolutely ready and remember that the legal age for consent in Australia is 16 yeas old.