I’ve always been envious of those people that can just talk really easily to new people they meet and don’t seem to get nervous at all.
I have bad social anxiety, and its impossible for me to be myself when meeting new people, or be at all confident. I get really sick with anxiousness when I’m going somewhere I know a lot of people will be.
I need to get over this because I’m going to college soon and no-one I know will be there..
Is there anything I can do to stop this? Any tips…?

Take a speech class. This helpful, because you have to overcome it and everyone else is in the same boat. You are also thinking about other things, such as what you are speaking about, learning to become more organized and prepared around others, more composed, etc. Join some clubs where you can learn about something you are interested in, and be with others with similar interests. Volunteer to help others in some way. This will help you think of the people you are helping, and think less of your insecurities. It could be fun, too. Get a pet. They are nonjudgemental, help you get out with others (if it is a dog), fun when people say, "What a cute dog" and ask questions about the cutie. Or volunteer with a rescue league where you can help with the pets, but not own one if you are not in that position. Get more sleep, cut down on caffiene, eat a healthy diet, remember that we all have faults. We might be to short, too tall, fat, skinny (yes, they make fun of that, too), too talkative, too quiet, etc. You are you and you need to appreciate who you are. Try writing down everything about yourself you like or appreciate. Then, try thinking about these things, more often.