At your age feeling hungry (because you're undergoing MASSIVE bodily changes including growth spurts), breaking out and experimenting with masturbation is NORMAL. It's actually a good thing to know how to pleasure yourself, knowing what makes you feel good will help you later on when you are having sex to make it as pleasurable as possible. She is over-reacting and if she reads your diary and doesn't even listen to what you say means she has her own issues. Talking about it to a school counselor can help and maybe find a female relative (older cousin, aunt, grandmother) who you trust to listen to you, support you and intervene on behalf of you. As well, having a boyfriend doesn't mean that you're having sex with him. Most girls your age enjoy having a boyfriend for all the affection, not the chance to have sex. I had my first boyfriend just before my 15th birthday, then had my second one a few months later and we only had sex after about a year and a half of dating.
Thongs aren't perverted, in fact if you're wearing clothes where a visible panty-line would look vulgar or if you want underwear that doesn't bunch up given half a chance, thongs are the way to go. Depending on your personal preferences they may even be more comfortable than normal underwear - I personally think they're slightly more comfortable than normal underwear.











