I can see what is probably making you a losing player, on the video at 18 minutes and 6 seconds, you play 2 hands the same.
They are both medium strengh's hands best to use as bluff catchers.
Ill start with the A♠:6♠: the flop is 2♥:4♥:A♣:
Preflop
This is fine, BB calls your steal lets say he has somthing like 22-JJ A2s+ and 2 picture cards, and most suited connectors for your min raise.
Flop
The flop is A high rainbow, not very dangerous at all 54s is the only hand that hits a draw and its a bad one.
Your cbet here is very bad with your top pair weak kicker, he will fold his entire range, and only call you with a better hand, you should be checking back this flop and giving him chance to bluff on the turn.
By doing this, you play your hand more deceptively, he doesnt believe you have an ace more often on the turn when you bet, and you get called by smaller pairs
Hand2
Preflop
You steal with K♠:T♠:, you get 3bet and someone cold calls the 3bet, your hand is crushed here, you should fold.
The guy in BB has probably got a big hand, SB probably has a better hand too, playign with 100bb stacks this is a fold, you wont hit enough draws to make this profitable.
Anyway to the point, you make a simular mistake to the one i mentioned above.
Lets give ranges
SB - AT+ 22+ 54s-9Ts could be wider could be tighter
BB -TT+ AK
BBs call is very strong he will often have this range unless he is a bad player.
Flop
Action gos check, check and you cbet, again this is very bad, bb would probably lead with AK after sb checks, he could check, so bb has a hand like TT-QQ possibly AK, You bet 30% witch is ok, TT-QQ could call with that, but then you bet 3/4s on the turn, with middle pair, this bet will only ever get call by a better hand.
I would of checked this flop called and let sb bluff his trash, hopefully, if not bet about 30-50% myself and check river.
Summary
You are being too aggressive with medium strengh hands like tpwk and middle pairs
This month I am loosing 1.5bb/100 over 10K hands. 
