Well... Having fun isn't a problem at all.
I'm pretty sure I'm also a fun loving creature and have had a lot of fun while studying.
But when it comes to distraction, it might not just be that 'fun'. Maybe some other elements were there too... I don't know. Anyway never regret what you did coz you can't change them now. Everything is a good experience - that's how I think about life.
So you have completed the Diploma ya? Which is not a bad thing bro.
Yes try your best to start from the next semester... And don't stop having fun either. After all life is all about enjoying. But don't let them distract you and don't ever let them lose your track of life.
Sad, Depressed, hopeless, aimless... dark cloud...

Did you have a girlfriend bro?