How do I stop letting my self worth be based on winning or losing?

As the title says I have a problem with my self worth being based off of my wrestling record. Its like I see my losses way more impactful then my wins in a bad way. Like I feel like my losses make my mental health feel like shit. I have a problem with talking negatively to my self after a lost.

Earlier I texted my girlfriend about it because I felt like I was bottling shit in too much and she gave me advice saying ''Im so sorry you are struggling with this right now but I've seen you push through barriers and I know that once your in that flow state your unstoppable. I love and I am proud of you, you need to take your mind off of wrestling records and put it into why you wrestle.''

Her telling me this made me feel so much better about my self. I know some days I won't be that confident in my self but I think its apart of the process.

Any advice?