You are already 18 years old and still in the period of puberty. It is recommended that you pay attention to nutrition and eat more foods that can help increase breast size, such as milk, peanuts, soy products, pig's trotters and other gelatinous foods; You should also do more exercises that are helpful for breast enlargement, such as swimming, breast enlargement exercises, etc.; if you are over 18 years old, you can also use professional beauty cream to massage your breasts in the morning and evening to promote the breasts to gradually become larger.