I've had a lump on my groin, near my hip, since early november. Sometimes it hurts there when I walk. Should I be worried? (i have other lumps, too)

Enlarged lymph nodes. Sounds like you may have an enlarged lymph node. This is usually a reactive process related to a skin infection. If you have nodes swollen in other areas I'd suggest you visit with your doctor. There are many diseases involving lymph nodes and your doctor will need to run tests. Best of luck.