What is one way you can get a copy of your birth certificate?

It depends on whether or not you are adopted.

If you're not adopted, visit your state's Vital Records office/webpage to obtain a certified copy of your original birth certificate--this is essentially the same thing as having the original and will be sufficient proof of citizenship/identity for obtaining things like driver's licenses, Social Security cards/benefits, and U.S. Passports.

If you are adopted, and you live in Alaska, Kansas, Alabama, Maine, New Hampshire, or Oregon, you can also go to your state's Vital Records office and request a certified copy of your original birth certificate. Adopted people in any other state can only receive certified copies of their amended birth certificates, not the original record of their birth.