Look at it this way. MIT is a very small school. Your stats are good, but not great. There are considerably more highly qualified students just in Texas, much less the rest of the world.
MIT is the type of school where everyone is top notch. If you want to get in, you need to set yourself apart by more than mere academics. Be a leader in your field. Develop something signfiicant.
What worries me is that you are comparing yourself against others from UIL, but unable to even do well enough at districts. The invitationals tend to have lesser competition as some kids are not that into them. No requirement to participate at invitational to go to District. This is just a minor quibble, but it speaks to your lack of understanding in how you compare versus your competition. They are not just winning Texas UIL, they are winning international awards, too.
Don’t expect that being a minority with a great class rank and a very good test score is going to get you into schools of this caliber.