Let go of the past. You have a chance to move forwards in your life and you have to grab it. Just because there are people from your High School around does not mean that they have to influence the way you live your life.
The personal stuff in your blog is there and if it has been read - so be it! There is nothing that can be done now. The truth is out there
Some may even be impressed with your honesty, however if you don't want anyone else to see it, you can change it. That's really your choice.
You would probably be surprised to find out just how many High School students suffer from depression and are quite miserable. The best thing to do is to look to your future, not your past.