When you examine your penis, do you see anything out of the ordinary where it is sensitive such as a cut or abrasion or different coloring? Your sensitivity is not unusual for a young man of your age, going through puberty, with an exposed penis head due to circumcision. In time, it should lose some of this sensitivity, but not entirely, because sensitivity is needed for sexual activities.
This is a serious issue, you should talk to your parents. The Moyl May of snipped you incorrectly, which could or could have damaged you. It will need surgery to correct possibly.