About legal age of people in porn videos

When I was a teen, I was interested in watching porn. Out of curiosity, I used to watch different varieties and in particular, those involving teens (both boys and girls) and older people. Later I lost interest and stopped watching them. Of late, I became aware of the fact that some people don't strictly follow the minimum legal age of 18 criteria and still upload those videos. As far as I remember, I used to make sure that I wasn't watching those involving minors. But of course, as a viewer we can't know the exact age of those involved. So I was wondering if it does put as at fault in such cases where the video header clearly says that they are above 18 years of age whereas in reality, they are not.

I have stopped watching porn long back but I have been thinking lately a lot about these things after reading some news articles about how some young girls get sucked into porn industry and stuff. As such, I started feeling guilty for watching porn though I never had any bad intent and always tried my best to avoid shady porn. Of course, as teenagers are not aware of all these complicated issues, one cannot expect them to be so rational regarding this at such an young age. Moreover, at an young age I used to watch out of curiosity but learning that there can be so many secrets behind even the normal porn that we all watch is a little unsettling. So I just wanted to know your views about this as this is something everyone of those who watched porn must have faced sometime