Esterh, a “serious yeshiva” helps for the right boy only. You have to choose the right yeshiva for the boy not the yeshiva first. Also, I hate to break it to you but your shver may have helped you feel better but had your son wanted to hang out it would have stopped very little.
For me it was the best thing to go first year evn if my parents wouldnt have approved of everything I did had they known.