Hi whiskeyjoe...I think you should consider the difference between your friendships and your career. Which one have your worked hardest for and which one will you carry with you for the rest of your life.
The first job I had completely sober since being a stay at home mom was very important to me. I make friends easily, I am out going and trustworthy. People can depend on me. BUT my job is my job and although I made some great friends and met some great people I consider them an enhancement to my journey. My Journey. I didn't feel as though I needed to explain anything to them.
At this point I would say that your career, your schooling and your sobriety are the 3 more important aspects of your life right now.
I understand you may be feeling guilty about not telling them the truth but it doesn't sound like it's the right time to open them up to this. Go with your gut. How do you feel about it?