I appreciate why you feel offended, your parents are implying that in some greater or lesser way they don't trust you, and that has to be annoying and hurtful, however you are their child, so they are bound to be concerned and panicked over things like Snapchat, because for every thousand people who use it perfectly normally, there are a handful of weirdos bullies and perverts who don't and it's them who hit the headlines. I think maybe the way forward is to have a sensible adult chat with them and ask them if you can try it for say a month. You sound really sensible, so I imagine if there have been no issues during that month they will relax somewhat. It's important that you stick to your side of the bargain and don't abuse any trust they place in you if they agree to that. Just an aside, Snapshat is not all that so don't break your heart if they won't agree, I have it and never use it, and I'm only a few years older than you. My own parents never monitored me and I never abused that privilege, but you can't blame them for wanting to keep their most precious thing safe, so try to take it as a compliment rather than feel stifled, but I do understand where you are coming from. x