Seeking reassurance. I am insure about my size

Use the "bone pressed measurement" technique, the gold standard. Use a scale ("ruler"). Press the 'O' end against your pubic bone, pressed lightly to contact the bone structure.

Conform your cock to the scale/ruler, and measure to the tip. This should be done when you are erect as you can possibly be.

Subjective, absent a scale/ruler, you are in the average to slightly/minimally above. You should visit a health care provider, on the basis of the lesions in the pic.