OK - do NOT boil the mouse in the future - let it thaw at room temperature, then gently squeeze the mouse around the belly to see if it feels like it's thawed in the belly as well. THEN, put the mouse in a baggy in HOT tap water, not boiling water for about five minutes to give it a heat signature that your snake will see.
Your snake can NOT digest cooked (which boiling water does) prey.
Since you are not an adult, then one of your parents needs to assist you with feeding off the tongs and be willing to put their hands in the enclosure. When you take on the responsibility of a live animal, you are also responsible for making sure it is getting all its needs met.
One last thing, don't offer food again for another seven days. Offering food too often can also stress the animal out and cause refusals.
When all else fails, you may have to feed live.