My watermelon vine is gowing like crazy and blooming as well. The problem is there are no melons forming.
It is a pollination problem. When the flowers are not pollinated, the plant "aborts" the fruit because it will not make seeds. This article will help: https://www.gardeningknowhow.com/ornamental/trees/teak/insect-pollination-process.htm
You will need to hand pollinate. This article will help with that: https://www.gardeningknowhow.com/edible/vegetables/cucumber/hand-pollinating-melons.htm