how to rejoin life

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i browse reddit, 4chan, facebook, league of legends in that order.
each day, repeatedly. i did this for the last 5 or so years.
my brain has literally devolved and stopped working.
when i look back on what happened from age 21-26, i literally just opened chrome, browsed r_all, r_4chan, r_leagueoflegends, then facebook, the some 4chan boards. at the end of that i repeated it.
every hour of they day, every day of the week, for the last 5 years.
i was working in the meantime but i have recognized that my brain has devolved into an absolute mess that is incapable of solving the easiest tasks.
sometimes its 12am and i want to make breakfast and i start this mongoloid routine of time waste. the hours go by and i dont even eat until 6pm where i finally order pizza or some shit.
doing the same shit over and over again shrunk my brain to absolute minimum.
last time i was walking in the forest and it was a sensation just having some philosophical thoughts while enjoying nature.
i really need to get off this downward spiral immediately.
i dont want to sit on my fucking desk and feed my brain insignificant shit to just make the time go by.
my iq right now went from 140 during my studies (18-21) to probably 100 right now.
if i could opt to die a painless death immediately, i'd be so fucking indifferent to live to just say yes. but i rather want to be able to feel alive again