First of all, we can't deny that the innate sports talent is very different, but we can make up for it through our own efforts the day after tomorrow. Moreover, the physical quality of a person when he grows up is formed by the interaction of various comprehensive reasons. This leads to greater differences between people, so I suggest that the effect of your fitness should be compared with yourself, not with others. Don't set too ambitious fitness goals, but suit your own reality. For example, if you jump 130cm this time, then you should try to make yourself jump 135cm next time through exercise. In this way, you will constantly build your self-confidence and give yourself the motivation to stick to it.
Secondly, we should find a suitable exercise method, step by step, and don't be eager for quick success. Use your perseverance in the right place. You practiced this mental disorder with high intensity, and it was difficult for people with good physical fitness to persist in the second stage, but you persisted for three months. But here I can only tell you with regret that you may just be imitating blindly, and your movements may not be in place, and you can't achieve the real training effect at all. For a simple example, if you want to learn folk dance well, you will never dance well without basic flexibility, pace, body and expression training.
Finally, I will give you some suggestions. Look at your story, you have been weak in sports since childhood, it doesn't matter. Forget it. Start with the most basic and simple strength and aerobic training to exercise muscle strength and coordination. Strength training can choose kneeling push-ups, dumbbell bending, dumbbell arm flexion and extension, freehand squat, lunge, sit-ups and so on. And aerobic exercise can choose jogging and skipping rope. Through constant exercise, make your large muscle group and small muscle group more developed and coordinated, so that you can strengthen your control over your body and get better exercise ability.