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Be careful meeting people you met online. No matter how much you talk to someone online, you don't really know them as well as you think you do. Please make sure a trusted adult knows where you are, who you're with, and what you're doing.
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Condoms are important but they should never be your only method of birth control. Ideally you combine different methods (i.e. condoms + iud or hormonal birth control) so that if one fails, the other will be likely to work.
If your parents won't let you get birth control, in many countries there are government agencies or NGOs who will provide birth control to you for free.