My first conviction for common assault and criminal damage, it was a stupid mistake I regret.

I was given a 6-month prison sentence (Suspended) for 2 years.  I posted last year about being nervous the college judging me for my past cautions. Recently the college found out and asked me to declare, I did two weeks ago and now await their reply. At first, my mental health rapidly declined because for the past 3 years I have focused on studying numerous courses with the college passing and then decided to apply for the same course online.

How can those convicted do good in society if many doors close in front of them?

I am in the process of finishing my disclosure statement although when any forms ask for me to declare I get nervous and would like some advice about how increase my confidence? 
Two other application forms asked about my conviction and I pulled away before filling out in fear of discrimination. I am keen to get back on the ladder contributing to society.

I am not sure about employers asking us to disclose our criminal convictions are covered under the data protection act? Do they gossip to random strangers about my conviction? I understand they can talk within their company. 

Sometimes I feel defeated and other times happy, unfortunately, more times not.