Im sure we've all hurt people sometime in our lives. I know i have. Its good that your trying to find happiness. We all deserve happiness, we need to be able to function in society, and if your unhappy you won't be able to be a positive role model for people around you.
How you tried to make amends to the people you've Hurt? Maybe you should start there if the guilt about it is making you feel like that. Or if you have you just need to forgive and learn from your mistakes and try to move on.
Best of luck to you just:-)