How do you deal with chronic (excessive) worry about starting in life?

Looking for and preparing for college crap is next year. So, I’ve been paying attention to the real world more, coming out of the “shelter” ya develop as a kid shielded from the real burdens of life. There’s so much out there that’s dangerous. Real grown-up life is scary. I’m terrified and sick with worry. Is this normal? How do I deal with this?