To regret or not to??

I’ve never liked regretting. I believe that one should NEVER regret whatever he has done for behind every mistake, there would be a lesson learnt. However, I’m afraid that I might be in denial just to live up to this believe of mine.
Up till now, I sometimes wonder if going to KYS was the best thing for me. I know that whatever it is, I can’t rewrite the past, but if I was given the chance to, would I still want be known as a KYSer or would I rather go to St David’s? Looking at my brother, being so happy in St. David’s and getting himself involved in activities which I never had a chance to participate in, I can’t help but think, that maybe, just maybe, i might have made a big mistake. That’s when I start reminding myself of my own believe that I should never regret whatever I have done. Don’t get me wrong, KYS wanted what was best for its students. Everything had to be done there and then, according to what the superiors(especially after Mr.Maidin) thought was BEST for us students and I have to say, some of the rules were just plain SILLY!! Lights off at 11pm(during Mole-zuin’s) even at prep??!! Gee!! I guess as teenagers we are indeed rebellious and we do not like changes especially those coming from the people we are definitely not fond of. Then again, I did indeed have my share of fun in KYS which my brother would never have in his whole life. I had the opportunity to live in a dormitory and experience boarding school life like not many others would have. After all, KYS is a private boarding school, which, if you ask me, is WAY better (in all ways) than the government ones. So, i guess, the bottom line is, as an economist would say, going to KYS had the least opportunity cost, thus i shouldn't regret the decision made for it was indeed the best one.