Should I wait for MIT decisions/regular decisions or commit to Barry University?

So you’re only 15 years old?
If yes, this is going to be a challenge as most schools have age limits for living in the dorm (unless you have independent living arrangements).

From your past threads it sounds like you already applied to several elite schools and got rejected? Did you apply to MIT last year?
Unless something has changed dramatically, I wouldn’t expect different results this time around.

Is Barry a better option for you than schools in your home country? Is it financially affordable?

The probability of getting into MIT or others like it is very slim.