One daughter when she was a junior in high school had essentially no ECs (she did get a bit more involved senior year). She still ended up being 5 for 5 in university admissions, with merit aid, and is currently studying in a very good PhD program. One issue is that she had very good grades in high school. You also have very good grades in high school. The other issue is that she did not even bother to apply to schools such as Harvard or MIT or Stanford that are very highly competitive for admissions. You might similarly not want to apply to Harvard or MIT or Stanford. If there are 3,000 universities in the USA, that narrows you down to only 2,997 to choose from.
There are lots and lots of very good universities. For any form of engineering you will want to look for an ABET accredited university. There are lots of them and they are all very good (that is part of how they got ABET accreditation).
For the very highest ranked schools, such as Harvard and MIT and Stanford, they have a huge number of applicants with very nearly perfect grades and letters of reference. These schools need some other criteria to figure out who to accept. They use ECs as one way to distinguish between a very, very long list of students with perfect grades. For the vast majority of other universities, including many very good ones, grades and test scores and a reasonably responsible approach to life is sufficient to get you admitted.
As obvious places to start, you have very good in-state public universities in Texas with very good engineering programs. Given that I live a long way east and north of you I am most familiar with UT Austin and TA&MU, both of which are excellent, but I am pretty sure that there are many other very good universities in Texas.
It also wouldn’t hurt to get involved in something other than school work and TV and video games. Look at the clubs that you have at school and see if any of them interest you. Do you play chess? Do you have a rocket club or a robot club at school? Is there something else that interests you? Really this is not so much for university admissions. Rather, this is just a healthy thing to do with your time.
I am betting that you have very good academic advisors in your high school. Talk to them. If you have a 3.9 unweighted GPA from the top private high school in your city, there will be lots and lots of good options.
Sometimes in some private high schools students are overly obsessed with attending famous universities (such as Harvard, MIT, and Stanford). If any of your friends are obsessed with these famous schools, do not listen to them. Yes Harvard and MIT and Stanford are very good universities. However, there are hundreds of other very good universities. Out of the top 200 universities in the US, they are all good, and you should be able to get accepted to the large majority of them. Five or six years from now someone with a degree in EE from MIT and someone with a degree in EE from TAMU are likely to be working side by side, earning the same income, and no one will care which school you graduated from. People will care whether your designs work, and if you are designing physical electronics whether it catches on fire will matter. You can design stuff that works and does not catch on fire with a degree from any one of a very large number of universities.
And you will not need to spend $120,000 per year to find a very good university to attend.
Best wishes.