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I can understand your concern. A small lump on a testicle may not always been testicular cancer. Since you have mentioned that it is not growing in size and you don't have a family history of testicular cancer it might be unlikely for you to have it. However, for the benefit of doubt, it is always worthy to consult with a general surgeon who would be able to give a definitive diagnosis after a thorough examination of the lump. In most of the cases, physical examination is enough for the surgeon to diagnose the problem in testis. This may include looking at and feeling (palpating) the testicles and scrotum. You will be asked questions about your health history and symptoms, such as:

When did you notice the lump?

Have you had any previous lumps?

Do you have any pain?

Does the lump change in size?

Is only one testicle involved? This will help him to identify the cause of the lump on the testis.

Other conditions which could possibly be with similar presentation are varicocele (abnormal enlargement of the pampiniform venous plexus in the scrotum) , (hydrocele fluid-filled sack in the scrotum ), warts, inguinal hernia or spermatocele(retention cyst of a tubule of the rete testis). All are primarily surgical entity, and all of it are also treatable. So it would be appropriate if you can consult a general surgeon or Genito urinary specialist to evaluate you further. The surgeon might examine the lump and he might ask you to do few tests which will help in diagnosing the problem like ultrasound of the scrotum.

Do not be afraid. Most likely it is not cancer, and other conditions diagnosed of causing this problem can also be treated completely.

Hope this helps. feel free to ask  if you need further help.