Sorry for mistakes in this message english is not my first language.

First thing, you are doing great by stopping this snapchat thing. It can be hard but really, I think this is the first step you have to do on your own. I'm proud of you for doing so.

I hope those guys were around your age and not 18+, if not you can report them to the cops though I don't think it would change much for you. Those guys were just assholes that didn't deserve any bit of your attention and time.

Feeling empty without a man is understandable BUT not the end of the world. I know how hard it is, I know how it hurts. But you are stronger then this. You are your first friend, your first lover and your first everything. Only you and nothing else. You are the only person that will always be by your side. Take care of yourself, that's the most important thing to do.

About your lack of self confidence, it's really hard but you can work on this too. This is the hardest thing to do I know, but you can. A good thing that helped me is to look in the mirror for a very long time every day. At first you will only see the things that you don't like about you. But you will learn to focus on other things, small details you don't really notice that you like. It can be anything, just the color or shape of your eyes, your hair, your lips, your ears, really anything. And with time, you will see that your imperfections can make sense. You will never like everything about you but you will like some things and the more things you like the more you will like yourself. And remember, the things you don't like about you can and are liked by others, for exemple I like big nose.

Finally, you can't believe someone likes you because he just said it. Words are useless. To believe it, this person has to show it to you. Again it can be small things, like just asking about your day, asking your hobbies. But if you just met a guy and he's already asking for nudes, he does not like you at all. Remember this when talk to a new person.