I really think I ruined my chance at happiness
Are you sure? What makes you think you have ruined your chance at happiness?
Because I had found out what will finally make me happy and I thought it was lost to me forever.
It's great that you have acknowledged how you feel. You should strive to find what makes you happy. You can always find happiness if you work towards goals that you desire.
If it's right in front of me, why can't I find it?
I think you just need to try a little harder to get what you want. If you still think it is there, don't falter and keep moving forward! You don't know when you'll hit gold, and it might just be in the next opportunity.