I came back to my university from my hometown yesterday

The day before yesterday, I said goodbye to my family and left Fuzhou for Jinan by rail car at 7 am. After 13 hours, I arrived in the Jinan west railway station, tired and sleepy. Then, I took [the] bus to Jinan railway station with two of my friends and waited in [the] KFC beside the station for almost 4 hours.[]Finally I [boarded] the old train [at] 00:40 and arrived in Weihai  8 hours [later].[]I was [very] tired but I had to tidy up my dormitory, so I could not go to bed for a rest. It seemed terrible but was expected.

Notes: space after a full stop.

With the sentence "I was so tired but I had to tidy up my dormitory, so I could not go to bed for a rest." If you had typed "I was so tired !. But I had to had to tidy up my dormitory" the exclamation mark (!) would emphasise your fatigue.