My parents opted me out of sex education, can I take classes to learn more about the birthing process?

Yes. Call the hospital that you will deliver the baby. Ask them to give you information about child birth classes.
Yes. Can look on-line for free (reputable / non-x-rated) education, health dept / women's health, planned parenthood type of websites). Other options exist (health dept., OB dept at local hospital, community college adult-ed pgm, etc.), but not all of these will offer-depends on your location.