is it fine to surf porngraphy material alone?

It depends on who, what and why you're doing it. If it's because you're curious, sure why not? If it's because you're a guy who frequents such sites every now and then purely out of sexual needs that can't be met elsewhere, I guess it's normal. Everything in moderation right? As long as you're not addicted to it or hiding some deep dark secret, I'd say you're like many other people out there who seek out pornography as a form of escapism and release (for a lack of a better word).