Like Muse, and a few others have mentioned, providing your attitude doesn't get you stoved in you may actually get to meet some "weekend warriors".
Possibly at the weekend, maybe everyday of the week for about 6 months. You will probably realise that either you have been misinformed or you misunderstood about the "soldier when you like" TA. Some of those at 2 Rifles may be ex or even serving TA.
You do realise that there are fair few "weekend warriors" out there who have more experience on Ops and and of the Army as a whole than you do right now?
Now, go away, rejoin as another name, return and learn. The spectrum of military knowledge on this site spans Cadets to the Old and Bold, we even have a few foreigners, families and career civvies on here.
One more thing to ponder. If your face doesn't fit, it can be moulded to fit.