You need to start doing things. Start with your career counselor at school (the one you just graduated from) and ask! If they can't/won't help you, try the local library (yes, really, librarians are smart people).
What you want to be doing is performing, even in lousy productions. You want to get a union card (usually it's SAG, e. g. Screen Actors' Guild) as that will open up a lot more opportunities for you. A lot of very well-known actors got their SAG cards from really forgettable productions.
This means summer stock, it means more acting classes (you're nowhere near being done yet), it means networking. It may mean modeling if you can do it. Take singing and dance, too, as those might be your way in.
But talk to your career counselor and, failing that, your local librarian. And seriously make sure you've got a fallback position. Getting into acting is HARD. The failure rate is abysmal. You need options for what to do with your life in order to get food on the table if you cannot find a paying acting gig.