I had torsion of testis surgery 4 weeks ago, i askin so much because i am so scared. and i really want to mastrubate but i can't because i am scared.

It's ok: That shouldn't be a problem (as long as you are not in public)!

OK with caution: Surgery for torsion of the testis involves suture pexy of the testicle to the scrotum. In other words the free testicle that could twist is now fixed with suture to the wall of the scrotum. After 4 weeks, this bond should be approximately 70% as strong as normal tissues. Gentle masturbation is ok with a lot of lubrication. Take it slow. Listen to your body, if you have pain, stop. Nothing wild!