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I realized that if I lay on my back I can't errect properly and even if I stand I errect but not very strong, when I try to have sex, by the time I finish wearing the condom I lose errection.
I know I've been addicted to masturbation for the past 8 years, could it be the cause?
I suspect several things could be going on.
First, blood pressure in different parts of the body changes in different positions. When you're lying down, it's pretty much the same everywhere, but when you stand it increases in your abdomen and legs. An erection occurs when a little valve at the base of the penis relaxes and blood flows into the erectile tissue at a rate that's faster than the blood vessel that drains the penis can deal with. It would make sense for the firmness of the erection to depend to some extent on blood pressure. When you're lying down, the pressure is lower, so you never get completely hard; when you're standing, the pressure is a little higher so your erection is more firm.
However, assuming you're in generally good health otherwise, I suspect that's not the biggest factor.
I'm dubious about whether such a thing as "porn addiction" really exists in people who don't have serious psychosexual issues of various sorts. I suspect most of those who say porn addiction is something that affects loads of people have an agenda that involves some twisted views of what people should be allowed to do, religious fanaticism or the possibility of making a profit from schmucks who feel guilty about fapping a lot. Having said that, I am certain that porn desensitises you. This is why the normal porn-watching pattern is for people to find tame stuff highly arousing at the start, but for them to gradually move to increasingly extreme scenarios.
When we immerse ourselves in a film or a story we're reading, as far as our brains are concerned, we're experiencing that for real. If your brain is used to sex that consists of gorgeous women doing outrageous things to you, then average sex with an average woman is going to seem pretty meh.
While I think the no-fap movement is screwed up in loads of ways and the people pushing it have issues they really should address, it is a fact that very frequent masturbation - and particularly rough, fast masturbation - can reduce the physical sensitivity of the penis.
You don't say how old you are, but it's possible that could be a factor. The average man's sexual drive peaks at some point in his early twenties and then gradually tails off.
Finally, when you get down to it, an erection is a pretty fragile thing. As I said, it happens when a valve in the penis _relaxes_, and there are lots of things that can stop that from happening in the first place or make the valve close soon after it has opened. It's a nasty paradox of erectile dysfunction that simply worrying about it happening again - consciously or subconsciously - can make it happen again.
I would say you're not being descriptive enough, but I really don't want a description of that. Although, based on what doesnormalmatter has said, watching porn builds up an "immunity" to sexual activity in the penis. From what I know, my advice is to stop watching porn, at least for a while. Maybe finish No Nut November without doing said action again, then try having sex.