APK,
WHile you are young, unfortunately you are getting a (bitter) taste of what getting old means. Dadgummed injuries take freaking forever to heal.
The only thing you can do is to let it rest to heal itself. I don't think it is ripped; might be much more painful if it were, but I'm no doctor. Maybe Bones can help on that issue.
Until you are 100% certain that it is healed, I would, if I were you, not bowl 10 games at once. (Heck, after 2 games Monday, you felt some ache/pain. Remember?) I had a groin pull several years ago and it eventually healed.
FYI Phillip Marlowe (here) had one several months ago. If he doesn't chime in, message him.
One last thing, this does point up the importance of stretching and warm-up before bowling, even for not-old (trying to be polite here) adults. That will drastically reduce the number of such injuries. One of those stretches is for the inside groin muscles area. This is a SPORT, the way you and many others play it.
--------------------
"Just because you can do something does not mean you should do it."