I feel a small bump at the end of my left testicle wich is attached to this small bumpy coils feels like veins .. is the bump normal ?

Most likely yes: You are most likely feeling your epididymis , which is a normal structure involved in the storage of sperm. You should have the same structure on both testicles. If you are concerned about it, have a physician examine you in person to see and feel exactly what you are concerned about.

No, not normal: This is likely a varicocele which may need to be fixed. Also, there is always the possibility of an adjacent mass, even testicular cancer, so I would recommend that you make arrangements to see a urologist as soon as possible. The most likely diagnosis is a varicocele, which is a benign collection of abornal veins adjacent to the testicle and is usually only on one side.