There are clinics and centers where you can get free hearing tests and other free medical care. Just search for "TX" (or whatever town/city you're in in Texas) "uninsured" and "free hearing test."
Just because you've been able to mostly "get by" without hearing aids doesn't mean you aren't hard of hearing. The only way you'll know for sure whether you are or find out what type of hearing loss you have (if you have one) is to get your hearing tested. Many people who are HOH don't wear hearing aids and you wouldn't necessarily know they're HOH unless they tell you. I used to be one of those people; I'm almost 50 years old, have been HOH my whole life, and just got my first hearing aids 18 months ago. I have moderate hearing loss in one ear and severe hearing loss in the other.
The different levels of hearing loss are measured on an audiogram such as this one (it's just one example) that also shows where certain speech sounds and other sounds can be heard: http://www.hearinglink.org/what-is-the-speech-banana Even a mild hearing loss can mean someone has difficulty hearing certain sounds, so would still be considered HOH, and some people with mild hearing loss wear hearing aids.
Most American health insurance plans don't cover the cost of hearing aids for adults, which is one reason why there are so many HOH people who don't have hearing aids. There are also HOH people who could afford to get hearing aids and choose not to get them. If you get your hearing tested, at least you'll finally know for sure what your level of hearing is, and you'll also be able to ask a professional any questions you have about your hearing.
You said in this post and another post in a different thread that you have "bad" hearing but you either don't think it means you're HOH or you're not sure if you're HOH. You seem confused about HOH in general, so - especially if you want to eventually be an ASL interpreter - you should get your hearing checked out and learn more about what HOH means.