I go to my university through bus. I go to the bus station without any mahram. Is it sinful? And as in the university bus I alone go without mahram. Is it sinful too?? What if I don’t have any mahram to take me there, in this case would it be sinful too??
If the university is within your city limits then no problem in this as long as it’s safe to commute.
The prohibition is for a woman to travel out of the city borders without her male mahram. It is prohibited to be in the bus alone with the driver without any passengers.