Rappers Battle

What do you mean keep it real, could someone please explain
 When reality's just light interpreted by your brain
 And if mine and your perceptions ain't one and the same
 Which one of us is normal which one is insane
 The skin never forgets a deep abrasion
 Yet your brain often forgets deep conversations
 This annoys me due to the nature of humanity
 Want to remember the good,
 not just the bad things that happened to me
 And yeah, I understand the minds an intricate tapestry
 So is the skin and that still records damage, see
 
 This scar above my eyebrow's from when I was a kid
 And my skin has kept a record of the damage I did
 Twenty some years down the line from that very day
 Documentation of carelessness and the price that you pay
 Yet it's over complex brain that sits inside of my head
 Can't remember the last things me and my friend J said
 I don't want to be just devoid of desire
 I don't want to be another bird on the wire
 I don't want to be just a log on the fire
 I don't want to be that at all
 I got a heart rate that's erratic
 I guess god fucked up the schematic
 I can't hack it and I panic and that makes it go pneumatic
 Causing landslides t-t-t-tearing up my insides
 Sometimes I think I'll live forever, but I know I won't
 When I really should be working on my flow I don't
 I just sit here and read extracts from this note I wrote
 Trying to find something that is worth a quote
 Fixing up mad Bitches like lobotomy stitches
 When I hit a tight rhyme see my leg it twitches
 I ain't into this game for the fame or riches
 Good to write tight rhymes, street poems and scriptures
 Now what's the point I'm making? Why I am saying this out loud?
 Am I convincing myself or pandering to the crowd?
 You can hear every word, you would still never know me
 Like Sean Penn could win 10 Oscars but he'll still be Spicoli