Need help picking a sport? Major Flaw LOL!?

Im 16 and a guy...
So my mum simply hates the fact that i workout with dumbbells in my room even though im getting results... So next year she told me that I HAVE to pick a sport... trouble is im anti-social and I generally hate sport... im approx 190cm ( 6.2 feet)
Im fit and have no problems
And im quite thin... ... I was thinking of doing paintballing because its fun as hell but its out of the question because it expensive and its too far away..
I dont want to do:
Soccer,football, Basketball,swimming,athletics,tennis,cycling.,gymn astics,cricket,volleyball, Martial arts (already done that and quite boring)
No water sports because they are annoying
I have no hope :( theres like no sports that I want to try out!
Maybe ive missed a few that might interest me?
Why is it that I dont like sports?
Is there a sport that works on building muscle more then actually burning it off?
Also, is there any sport where theres a mix gender? Because the ones I had been to a few years ago only mostly had boys! and it would be nice to have a mix of both....
HELP!