I am now 26. I have been masturbating on the bed with my bed quilt when I wake up in the morning for over ten years. I lie on the bed rubbing my penis against the bed quilt, and eject on my underpants. Sometime I may also rub my testicles carelessly.

Will such masterbating position cause testicular cancer, as such rubbing may cause pressure on my testicles?

In other words, will long-term physical pressure on testicles generated by my case, by tight underpants, or by wrong sitting position a risk factor causing testicular cancer?

I start examining my testicles recently, and I find that my left testicle is a bit bigger than the right one. There is no pain, and the left testicle is as soft as the right one. Is it likely to be a lump or swollen testicle?

How does a lump in testicles feel like? Is it a bean-like solid on the testicle?