As someone who converted to Judaism years ago, I feel your pain. There is a lot of anti-Semitic hate online, some of it being spread by bots and propaganda, but a lot by ignorant and hateful people. You are not alone. I ran into a lot of this behavior. If you can, limit your exposure online to these comments and choose communities that are friendly and seek to improve things. Those people who are mocking you are not your friends and you don't have to be around them. Focus on the people immediately around you, and your friends. There is so much to be proud of in Jewish history, culture, beliefs, and actions, from Tikkun olam to the development of the polio vaccine to our scholarly traditions. When you go off to college, see if you can connect with other Jewish students, a nearby synagogue, or Hillel or other Jewish institutions there. They can provide help and it feels good to be around people. You said your family became disconnected from the local synagogue, but you can always reconnect. If you are in the United States, Introduction to Judaism classes can provide a lot of useful information, and they may be a good place to start. Judaism is about life--celebrating life, living a good life, and being together with others. Harold Kushner's book "L'Chaim" is very good on this: https://www.amazon.com/Life-Celebration-Jewish-Being-Thinking/dp/0316507350 Sending good thoughts your way and this too shall pass. Enjoy your time at college and reach out if I can help in any way.
