I have 2 swollen lymph nodes, one in my groin area and one between my boob n armpit, what could this be?!

Infection or cancer. Go in right away and see your doctor. Lymph nodes get enlarged when they are fighting an infection or have cancer. A good history and physical with right blood tests and x-rays is the only way to figure it out.
Monitoring Centers. Lymphatic system absorbs/carries things too big to go into the arteries/veins like bacteria eaten by white cells/digested food. Lymph nodes "taste" the lymph everywhere for bad stuff like bacteria/viruses/cancers, etc. When it detects a problem, it alerts the immune system and your body reacts. They enlarge in response to the inflammation they create when they react. They shrink when all is well.