I sold cars for a short time back in the 80s. One of the things that stuck with me from training was this. The manager asked the question "How much should someone pay for a car?" Everybody weighed in with one thing or another, and he finally said "What someone should pay for a car is as much as he's willing to pay for it."
So it is with you. If you're willing to work for $11.75 an hour, then work for $11.75 an hour. If that's what you're willing to work for, then that's what you're worth. Now, if you're developing some front-end developer skills, you'll be worth more pretty quickly. But you sound impatient. You have only "recently" begun doing this kind of work, so you're probably talented (since you're the one who got the job) but don't have much experience.
Think of it as getting paid to go to school and learn a higher-end skill. Put the time in, get some deliverables under your belt. If you start focusing on the idea that they might be using you, that's not going to take you anywhere you want to go. Even if they are using you, you're using them, too. They picked you up when you didn't have any experience, and gave you an opportunity to move up. Keep that in mind. They're taking a risk to give you this job, because if you don't work out they're not only out what they paid you, but whatever project you're working on is going to be delayed. So, you can worry about whether you're getting paid enough for your job title, or you can take the time to invest in your future by developing valuable skills.
I have a brother who got a Master's in Fine Arts 30 years ago. He was a great artist, but he didn't know a thing about computer graphics. He worked in some small toy factory for a few years, then quit his job and moved with his wife to Seattle. He looked around for a job for a bit, and then walked into a computer graphics place and offered to work for free so he could learn graphic software. (I know most of us can't afford to do that, but his wife had a good job and understood that he was investing in his future.) He did that for over a year before they created a position for him and started paying him. He stayed another year or so, and wound up a stone expert in UI/UX design very early on. Then, he got a contract at Microsoft, designing stuff for early versions of IE. 25 years later, he's still there as a full-time employee and doing extremely well. Now, if he had been worrying about people using him, he'd probably be working in a factory packing software boxes or something. He would have been using his imagination to imagine where he didn't want to be instead of where he did. And, he would have gotten there.
So, see that you don't wind up in a place you hate. By fearing that you might, you put your energy into imagining just the situations you want to avoid. By doing that, you make it more and more your reality. So don't do that! My advice is to stick with it for at least six months, and see what develops. They might offer you a job for pretty good pay, especially if you're good at what you do. Forget about what you're paid if you can live on it, and focus on doing the best job you can. If you move, don't do it for higher pay. Do it because you found a more interesting job. More interesting jobs in the IT business generally pay better, too.
Keep focusing on what you do want. If they aren't the ones to give it to you, you'll know soon enough with a bit of patience. As you focus on the things you want, opportunities have a way of coming out of hiding.