Want to major in technical theatre-literally NO experience HELPPPP

at the end of junior year i decided i wanted to major in technical theater. i have no experience at all and most colleges require a portfolio. I’ve been in two musical theater productions but as a performer and i currently have a video production class. How do i go on about this? do apply for a regular theater B.A and then make my way into a B.F.A for tech theater? PLEASE HELP