Hy!

I have to say that I don´t look at his stack size and feel bad when he raises and I see that I have just prized me in for a call when I´m behind. I see it as a big mistake. Am I right?

36 hands on my opponent 17/17 Cbet 100% (1)

And just as a general question:
If the stack sizes would be ok would you say it´s better to reraise this flop or the same flop when there are for example two hearts on board?

Because I bet as a semi bluff I tend to this board because there´s more Fold Equity.

Poker Stars No-Limit Hold'em, $0.10 BB (7 handed) - Poker Stars Converter Tool from http://www.flopturnriver.com

saw flop | saw showdown

UTG ($9.59)
MP1 ($4)
MP2 ($4.40)
Hero (CO) ($10.40)
Button ($10.27)
SB ($4)
BB ($18.19)

Preflop: Hero is CO with J, Q
2 folds, MP2 bets $0.25, Hero calls $0.25, 2 folds, BB calls $0.15

Flop: ($0.80) 10, 7, 9 (3 players)
BB checks, MP2 bets $0.61, Hero raises $1.80, 1 fold, MP2 raises $3.54 (All-In), Hero calls $2.35

Total pot: $9.10