Holy cow, you've got a whopping case! I'm a newbie empath too, and I'm finding Elise's exercises (on this website) helpful. I would recommend reading "Self-Care for the Self-Aware" by Dave Markowitz. And find yourself a psychic healer or a shaman, someone who "gets" empaths. As a newbie, I wish I could give you more advice, but that's a start.
You're not a creep and you're not weird. It feels terrible in the beginning, not knowing what is going on and how to shut off other people, but believe me you are so lucky to recognize this at such a young age it is truly a blessing. I'm 24 and I have just come to the conclusion that I am an Empath a few months ago after years of depression, mood swings, having a manic episode being in a psych ward twice diagnosed with having bipolar disorder and being put on meds that numbed me for about 3 years of my life. I wish I would have known this when I was a teenager. I know it probably feels overwhelming, but trust me you are so lucky to know this now!!! I would contact Elise and have a session with her, she has helped me a lot with getting my life in order and I believe she would be of great help to you as well. Here is a link to her website.
You will learn how to manage your empath abilities, I believe all empaths feel like this is such a curse in the beginning, but I promise you it gets easier and you will become a smiling emapth Sending lots of love and light your way. <3