Of course there is a way to “fix this.” But you probably can’t do it on your own. Whatever happened was traumatic enough that you dissociated from the memory for a time. Then your brain did what brains often do to people who are traumatized. It divided your emotions between feeling bad and not feeling at all. Losing your feelings was your brain’s way to protect you. But it’s no longer helpful. You need to relearn that there is a huge spectrum of emotion available to you — from feeling terrible to feeling kind of numb and apathetic to feeling at peace and happy again.
That’s what therapy can offer you. With some serious work on your part, you can learn to feel the range of feelings again. You can also take a new look at what happened when you were only 13 to reexamine whether your evaluation of it at the time was accurate.
I hope you will take yourself seriously. You have a serious emotional block that will get in the way of friendships and love for family and potentially love for a romantic interest for the foreseeable future. These things rarely fix themselves. You need and deserve the guidance and support of a professional.
I wish you well.