Standardized testing

I am a junior with a 3.46 GPA and have some extracurricular activities ( volunteer firefighter, manage the girl’s basketball team, 2 jobs, 2 clubs, and 2 sport with one academic award w//200+ volunteer hours). I am taking the ACT in February but I already know that I am not going to do so well. The school I want to attend is test-optional. If I don’t send in my scores, will that have an impact on my college admission?