ETHICAL CONUNDRUM

Hi, I am a 2nd year fine art student doing my BA and I recently had my end of year assessment. The assessment was of no real importance if I had failed I would simply re-sit and in my prior assessment a couple of months ago I got a really good grade and I believe I will do just as well in the recent one.
As I knew that for this assessment that - unlike the others - I would not be in attendance for the 20minute presentation of work shown to two tutors (who I admire and whose opinion I respect), I made a stupid error of judgement and decided to discreetly place my mobile phone out of sight whilst it was left to record there conversation. I realise this was wrong but I had clearly give in to the side of me that thought 'what they don't know, doesn't hurt them' and seized the opportunity to get what I believed to be a more honest opinion/genuine reaction of my work. I was caught!
Whilst listening to the recording I noticed one tutor whispering to the other "he's recording this...watch what you say". They did not react by picking up the found mobile and bringing me to book, so to speak; they proceeded with the assessment, performing what - if I hadn't noticed the whispering - would have believed to be a really encouraging response to my work, laden with compliments (sometimes notably with excess in what was quite a humorous manner for each others entertainment!)
I believe their reaction was a clear sign of them sympathizing with me. I believe they understood the reason why I went to such lengths and did what in hindsight was simply a desperate act born out of low self esteem and is why they never pursued the proper procedure of disciplining me - even though I'm unsure if it would even be worthy of a disciplinary as the assessment was so insignificant. It was however an invasion of privacy.
I now feel completely embarrassed as you can imagine and I don't know how I am able to look them in the face again!!! The embarrassment feels almost too much to bare and the invasion of privacy shows me to have questionable morals, sneaky and a lacking in respect for other peoples feelings. Although I think this is untrue perhaps 70% of the time, this whole situation has forced me to confront my demons and address the missing 30% which I believe is partly due to my lack of self esteem. I have made an appointment with the school counselor today and I will really try not to be so selfish in future and give more consideration to other peoples feelings. If I am honest, I am not even sorry I was caught (blessing in disguise really!); I am sorry for invading their privacy though.
The question I now have is this: Do I act like I never heard their whisperings (during the recording) and noticed that I was caught, as I can only imagine they believe or may even want; or do I come clean and say sorry?
I doubt that they would say anything to me first as they are proffessionals and probably would like to keep our relationship the way it is, which is why saying sorry might be adding insult to injury on my part as that would mean not only invading their privacy but then putting them in an awkward position of having to listen to my excuses and probably feeling the responsibility to do something about it by helping me. So ultimately I suppose saying sorry is another selfish act by me in the form of clearing my conscience at their expense. However I think that i owe them an apology but also the knowledge that their good deeds of 1) being sympathetic towards me 2) having understanding and 3) not disciplining me and making me feel even more embarrassed - has been the catalyst for me seeking help with my mental health and gaining a better understanding of why it was wrong in the first place.
If i say nothing, I will always be reminded of how they probably think I am an absolute slime ball with questionable morals as, as far as they know, I probably have not learned from my mistake and also will probably be just as embarrassed every time I see them - not even to mention the awkwardness!!
Please help! What do I do, say sorry or not?