i think you need to go to a doctor
No, breasts leak in the latter part of pregnancy.
If you have lumps go to the doctor. There are many causes for these, but only a doctor can determine if there is a problem.
No. One of the most common reasons that breasts leak is because the woman just had a baby. If the breasts are not expressed regularly while a woman is lactating, they will get sore and they will leak. If the breasts leak at any other time, it could be a medical symptom.
Mammogram.
See your doctor.
Yes
Sore breasts, lumps on nipples, tummy cramps
Well, you feel two lumps on your chest and the area may be sore.
Yes
Yes there are chances of milk leaking when the breasts are fondled.
It's not uncommon, but almost all lumps found in the breasts of teenagers are harmless. The lumps could be blocked milk ducts, which will resolve themselves in a few months. They could also be solid masses of tissue, which may or may not go away. They could also (doubtfully) be calcium deposits. If you are concerned, go see your doctor about them.
See your doctor. A mammogram only screens the actual breasts. Any strange lumps need to be investigated.