How do I start therapy?

I really want to talk to a therapist or a psychologist, but I'm only 18 so I don't really have the money. I also don't have any friends or anyone I can talk to. I'm so tired of having only myself to talk to, but I just don't know where to go. I've tried googling "therapists in houston" (where I live), but they are all expensive. What can I do?