Your post made me smile and laugh a little when I read it. I know exactly how you feel. My OW training was at Clear Springs. The last dives on the second day of training were 1'-3' viz and I didn't like it a bit. I was getting panicky but kept the DM in shadowy view and made it through. Diving since then has been much better...don't let that part scare you off.
For local diving there are plenty of fun options for y'all. We use diving as a nice way to visit other parts of Texas...and eat BBQ. Throw the scuba gear and a suitcase in the Jeep and some bicycles on the back and head out for the weekend.
I second drifitwood's recommendation on the Comal River. Not far from Austin, it is shallow, clear and easy to dive. The viz will be much better. Water temp is @ 70-72 degrees year around. Put in at the stairs above the tube shoot, swim upstream and then ride the slow drift back to your entry point. There are plenty of fish to see.
The closest places for fills that I know of are The Dive Shop in San Marcos and Duggan's in University City. After diving, ease over to Cooper's for some BBQ or on Fri night McBee's BBQ for All You Can Eat Ribs.
When the water starts to warm up there are some nice sites at Canyon Lake. Duggan Diving has some nice maps here:
Duggan Diving :: Diving the world
I have also heard that there is good diving in the San Marcos river but we haven't tried it yet. When Aquarena Springs opens back up there will be diving opportunities there as well.
Clear Springs in Terrell and Athens Scuba Park in Athens are ok. I say "ok" but we dive them quite a bit. Viz not great bit we still go. If the water was just a little warmer I'd be diving now. It's a great way to work on buoyancy/trim, safety and emergency procedures, navigation (you get good using your compass in lower viz situations), gear, etc. all the while developing your confidence.
Around here, if we are going to do much diving we have to dive locally. It's not Belize but it is still diving...and can be lots of fun.
I have video of Clear Springs, Athens and the Comal River on my youtube channel:
grantwiscour's Channel - YouTube Take a look for some viz examples.
If you braved Lake Travis in Feb, I can tell you that the diving only gets better from here. You can dive locally and enjoy it.
Dive safe and welcome to Scubaboard...maybe we'll run into each other at a dock somewhere.