ok guys. i just got back from the gym. bad news

. but for now, let me write down my final workout plan.
DAY 1
Bench 12-10-8-6
Incline Bench 3x10
Dips 3x20
Triceps Pulldowns 3x10
French Presses 3x10
Pushups 3x20
Shrugs 3x10
Lateral Raises 3x10
Crunches 3x30
Hanging Crunches 3x8
Weighted Crunches 3x10
DAY 2
Chinups 3x4
Lat Pulldowns 3x12
Back Extensions 3x8
Barbell Curls 12-10-8-6
Preacher Curls 5x5
Dumbbell Curls 3x10
Leg Curls 3x10
Leg Presses 5x5
Leg Extensions 3x10
Calves 3x15
DAY 3
Wrist Rolls (a stick that has a rope coming out of the middle. at the end of the rope is a weight. i just roll the rope around the stick and then unroll it. killer.) 10x
Wrist Curls 5x5
DAY 4
Repeat Day 1
DAY 5
Repeat Day 2
DAY 6/7
Rest
it seems like a lot (especially to me

) but i have all day so.. yeah. anywyz, back to the problem i ran into. i used to lift a bit so i was able to bench around 110 or so. but i haven't done anything for like 3 months because i kept pushing it off and saying "wait til summer, wait til summer". now that it's summer, i'm finding that i can't do ANYTHING. like i struggle with stuff i used to be able to do in the past. for example, my plan with the benchpress was to do 5 sets (12-10-8-6 with the weight increasing each set). i did 12 of 95 lbs fine. then i was BARELY able to do 10 of 105. by the time it got to doing 8 of 110, i couldn't even get past my 3rd rep. i always seemed to do this in the past too, simply pooping out after just a few sets. eh call me weak but what should i do to fix this?