Why are my parents going to extrems about the littlest things?

I'm 15 in 2 weeks and I have a boyfriend who I have been with for 2 months now. Before him I had a boyfriend who really messed me about..
My current boyfriend, my parents both like unlike my original boyfriend. Lately I've began to realise that a lot of people I know and talk to are allowed to do a lot more then I do or want to do for that matter e.g. they smoke, drink or some are allowed to have sex.
I don't particularally want to do these things but my parents are slowly taking away little things me and my boyfriend do. The most recent is that I'm not allowed to lay down with him because

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Source: http://answers.psychcentral.com/RelationshipsandSex/why-are-my-parents-going-to-extrems-about-the-littlest-things-/

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