Dear, there is no relation of mastrubation with tightness if it is within limit.If you mestrubate excessively then it increases excitation central nervous system.Suggest to limit the process 2 times weekly and do take good diet ,fruits ,veges.
Next Steps
limit the process 2 times, do exercise and eat protein rich food, and be hydrated
Health Tips
Do planks 5×10 hold , contract you anal spincter 5×10sec.And take good sleep 8 hours.The all problems you are facing comes to an end