The second type is one-shoulder diagonal bag or one-shoulder bag. The leather bag is very nice and handsome. However, the business bag your father bought for you is not the type I recommended.
The third one is a shoulder bag, just like the girl's. This model is not popular among boys on campus. If you have that temperament, the bag will look good on your back.
Don't think too much, freshmen are growing up, and you will find your changes after one year.