You need to get stronger and bigger all over.
You seem to have reasonable muscle endurance but you are probably weak all over. Start making your pushups and situps harder along with training chinups.
Work towards doing freestanding handstand pushups and weighted hanging by your knees sit ups. Work you way up to one legged squats.
Every 2 days, work on these strength exercises and follow them with your endurance exercises.
Starting eating more, and make sure it's high quality food.
Stu
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