Give yourself permission to try again. Have faith in yourself. You're different now. You've learned so much.
The same challenges aren't going to have the same impact on you. Bumps in the road won't take you out like they used to. It is even possible that you can view things as positive and supportive that you used to perceive as negative. You can move through it with grace and come out more yourself on the other side.
The past is not the present. You are different now.