Ryobi, you're at that transition age where life starts to become "less about me" and more about the rest of the world and how you'll fit into it.
I would hope that you have a doctor check you out--sounds like you have some low grade infection going on (lumps in groin), but a doctor is the one to make that diagnosis. Don't let fear of knowing keep you from making and keeping that appointment. After dealing with some serious pain, I went to the doc and the knowledge gave me power to overcome it, so I can attest that taking action and responsibility for my own health is a good move.
These forums are full of caring people, and people with answers. My advice is to stop looking at causes, and go get answers and make changes for your future so your life and living have purpose and meaning--"getting outside yourself" as you wrote.
One dear friend said to me once, "Aim at nothing, you'll hit it." Get something to aim for--and good health and living a caring, giving life are good targets.
I hope to hear from you after you make that appointment.