Bienvenido a SubSim
your english is better than my Spanish so no need to worry about that.
Now if the ships that chace you are PT boats (the small ones with the torpedoes) you have nothing to worry. They cannot hurt you unless you're on the surface. They don't have hydrophones as well so you're OK. Just keep your course and eventually you will be far away from them. Now if you are in the vicinity of DDs things get more tricky. First of all go deep, really deep (150-180m) and go on silent running. Try to move away from them. To do this use the hydrophones to see where the destroyers are and move to the oposite direction. It takes time but eventually you will manage to lose them. If they start throwing depth charges away from you it's a good sign, so keep increasing your distance. If they throw depth charges at you start zig-zaging and pray.