Scared of putting

I can’t get over being terrified every time I’m about to put. Specially if it’s a birdie. My body gets tense and I’m very stiff in my motion. I’ve been practicing and competing for 4 years with absolutely no improvement. I know it’s mental for sure! I’m currently missing short ones more than long ones just because it’s a bigger deal if I miss. Any mental health advice? I’ve struggled a lot with fight and flight