Sounds like you might just have an instability, especially if the small manip to the pelvis with squeezing the legs together relieves the symptoms. If the pain is 'sharp' then perhaps there is some local tissue damage. This might be at the arrachment of one of the inner thigh muscles onto the pelvis. It so this does take a quite a long time to become pain free. Rest is always pain free but load the muscles and the attachment pulls. So running passing etc could be symptomatic.

You need to get in touch with a good sports physio who has a keen interest in biomechanics and your sport to get the appropriate rehab plan. p.s. never rule out a hernia or Wikipedia reference-linkConjoint tendon issue unless you've had some dynamic realtime ultrasound investigations.