I worked with a student who once lamented to me that the police in his neighborhood were so "bored" that they'd given him three speeding tickets in one month.
What? You're blaming the police?
Then his parents told me, "Can you believe how unlucky he is? To get three speeding tickets in one month!"
One of the most important skills a person can have is the ability to admit fault. Take responsibility. Own up to your mistakes and apologize if you've hurt anybody.
It's so easy to do, and it will go so far towards making you more likeable, responsible, and trustworthy.
Excuses rarely make someone like and respect you more. And it's not likely to work on colleges, either.