I am on F1 visa and have been paying rent in tx for a year. Am i applicable for Instate tuition?

I am on F1 visa and have been paying rent in tx for a year. Am i applicable for Instate tuition? I do not live in the university campus and im 23 years old.

No, you are not eligible. Paying rent does not qualify for in-state tuition. You either need to work on H1B or L1B for one year or at least have 0.5 FTE TA, RA or GA. Also, these rules vary by state, you will need to check with your school for specifics. Read In-state Tuition Eligibility