Yes it sounds like you have ruptured your hamstring muscle or avulsed the attachment of the muscle. This usually happens high up the muscle at the ischial tuberosity ie the bone that you sit on. This can be diagnosed by Wikipedia reference-linkMRI.

Avulsions can be surgically repaired but this should be done in the first few months. For those who have repairs they need to totally rest for 6 weeks and go easy for 6 month and take a further 6 months to restore strength and are usually very painful.

So letting it heal itself is not such a bad option. You may not get a better outcome by pursuing surgery ( but obviously take your advice from a reputable sports physician!) just accepting the slight weakness and tightness around the scar tissue. Adapt your sport technique and keep trying to strengthen your hamstring.

I have seen one person who didn't get the repair and although she still get frequent symptoms she just ignores them and just carries on doing sport aerobics at national level. The other one has had the surgery and is still not yet able to do any sport (Repaired about 4 months ago) still getting lots of symptoms because the scar tissue wrapped around the sciatic nerve.....