I feel my knee sting and it feels weak, it could be by squatting to heavy and lokcing the knees. what could the problem be? (globally)

Knee discomfort: This type of discomfort may be a simple chronic sprain or there could be an inflammatory process like tendonitis or even internal derangement such as torn cartilage. However at this time I would just rest the knee and then gradually resume normal activities. If symptoms persist, worsen or if swelling develops, consult an orthopedic surgeon for evaluation.