You do not even have to watch porn daily to be addicted. To know if you are addicted is easy.
1. You cant quit
2. You keep having urges to watch and even if you have no real urges your brain still reminds you to get that dopamine fix.
3. You get depressed/anxious after a porn binge
4. Need more hardcore porn to get stimulation (tolerance)
4. Life itself is super boring and nothing brings motivation, except the motivation to put on a porn site and jackoff to it
5. You have erectile dysfunction problems, cant masturbate without porn, have no morning wood, or no desire to try to have sex with a real person
6. When you quit you start getting withdrawal symptoms after a couple of days/weeks
7. You start getting (wet)dreams about watching porn if you have quit watching for a while
I think your ADD, depression problems comes from a screwed up reward system because of the porn/fap addiction and the amphetamines you keep using (and might keep you more horny). The amphetamines will only make things a lot worse. Your dopamine levels and receptor sensitivity is so low that it makes you depressed and gives you more ADD like symptoms. To get a relieve for that low dopamine you return to porn again for the dopamine fix, and this will start the addiction downward spiral (more downregulation of dopamine d2 receptors which give more depression, anhedonia, anxiety, sleep problems, urges etc.). I think it is good to start that 90 days of abstinence from porn/fapping/sex/orgasm/amphetamines and see what happens after 40 days. It can take a while for positive changes to be felt and you might actually start feeling worse at first because your brain misses that high dopamine fix. This can cause withdrawal symptoms like anxiety, more depression, fatigue, flu like feelings and even more libido loss. Also try not to fantasize about porn or sex because you will activate the same pathways that brought on the addiction (pathways that are sensitized to porn by glutamate and DeltaFosB). Try to live as a celibate monk for 90 days in your life and see what happens. After you start feeling better you can implement masturbating by touch alone (without porn) and sex again. It takes some willpower but maybe it is worth it.