Take a deep breath and relax. Adjusting to college is a process.
First, understand that it is a time to leave the worst of your high school self behind, and tap into the very best of yourself with this new start. Everyone is new to college, be your best, most authentic self.
Make it your business to find everything. The library. The study support available. The best tacos. The best time to take an exercise class. Do all the corny stuff - make t-shirts, do the competitions, cheer the teams - some of it will stick and some you will find you can do without. But, try it all.
Find your tribe. Who are the people that make you comfortable? It could be a cultural. religious, or identity-based affinity group, or it could be common activities - like actors, or swimmers, or dancers. Find those people, you want to know where to go for the "comfort" feeling. (And, it's not just friends your looking to make, you're also looking to find conversation that feels familiar, even if you're not "best friends.")
Find friends in many different places on campus.
Pay attention to the "adults" around you - try to connect with one or two - it could be a professor, an advisor, or someone else on campus who understands how things work and can guide you when you hop off the path a bit. In high school, we called them "trusted adults." In college, we have lots of different names for them - but find them!