Today I took 2 tab of Advil (ibuprofen) liquigel and after them I felt for first time burning in urine. Could Advil (ibuprofen) be the cause?

Rarely reported. Though it has been reported, burning on urination would be very rarely associated with Ibuprofen and much more likely to be related to other factors (and likely insignificant factors in an 18 y/o). Would just monitor.