My penis size is 6 inches and 3 inches thick is that good for a 12 years old boy?

Is that like more then the size of half of a water bottle? Will it grow more longer and wider when am 14? Please help me please search everything because am trying to at least have sex when am 14 and or 15. Please will someone help me I really need to be prepared I need to know so I can know if my girl friend is gonna be thrilled with my sex but I don't want it to be my current size please someone help me please I am very desperate to recieve my answer the quicker the better please reply fast ok