I think that you are competitive at all of these schools. However, they are reaches. I would put your acceptance chances as lower than the overall acceptance rate at Stanford, and perhaps close to the overall acceptance rate at CMU. For UMD the issue is mostly that you are out of state. If you were in-state I would think that your chances would be excellent. Of course you are in-state at equally strong universities in Texas. I do not understand why you would pay out of state prices for UMD when you have UT Austin and TA&M as options in-state.
Given the excellent quality and relatively reasonable prices for your in-state public universities in Texas, I hope that you are also applying to several in-state public universities.