it's this opening bad

[Event "Rar5665 vs. hedafuss"] [Site "Chess.com"] [Date "2024-01-01"] [White "Rar5665"] [Black "hedafuss"] [Result "0-1"] [WhiteElo "524"] [BlackElo "629"] [TimeControl "300"] [Termination "hedafuss won by checkmate"] 1. e4 c5 2. Nf3 Nc6 3. Bc4 e6 4. Nc3 Bd6 5. d3 Bc7 6. O-O Nf6 7. d4 d5 8. exd5 Nxd5 9. Nxd5 exd5 10. Bb3 cxd4 11. Nxd4 Qd6 12. Nxc6 Qxh2# 0-1 the chess engine always says I'm off book and the move is ok but not good. i use this opening alot i really like getting my dark squared bishop behind my queen like in this game i posted my opponent unfortunately didn't see the check mate coming so the game ended quickly but since i am only 500 to 600 rating i was wondering if the opening is a good line to follow or if my opponents are allowing it to be a good opening of course it is based off the sicilian so it can't be that bad but the chess engine doesn't seem to like the dark bishop double move that i like so much any thoughts would be much appreciated

And sorry about the game i can't figure out how to post the game board

1. e4 c5 2. Nf3 Nc6 3. Bc4 e6 4. Nc3 Bd6 5. d3 Bc7 6. O-O Nf6 7. d4 d5 8. exd5 Nxd5 9. Nxd5 exd5 10. Bb3 cxd4 11. Nxd4 Qd6 12. Nxc6 Qxh2#

[Event "Live Chess"]
[Site "Chess.com"]
[Date "2024.01.01"]
[Round "?"]
[White "Rar5665"]
[Black "hedafuss"]
[Result "0-1"]
[ECO "B30"]
[WhiteElo "550"]
[BlackElo "595"]
[TimeControl "300"]
[EndTime "10:13:17 PST"]
[Termination "hedafuss won by checkmate"]

1. e4 c5 2. Nf3 Nc6 3. Bc4 e6 4. Nc3 Bd6 5. d3 Bc7 6. O-O Nf6 7. d4 d5 8. exd5
Nxd5 9. Nxd5 exd5 10. Bb3 cxd4 11. Nxd4 Qd6 12. Nxc6 Qxh2# 0-1

Thank you for getting the game board up there tygxc could you elaborate a little on why it's bad

5 d3 is tame. 5 d4 exposes that Bd6 is badly placed, as it is vulnerable and blocks pawn d7.
9 Bxd5 exd5 10 dxc5 wins a pawn
Just 12 g3 is good for white. White gains the bishop's pair with 13 Nb5. The isolated queen's pawn d5 is weak.

Nah its not too bad.

Black did a good job and white overlooked a mate in 1 from the queen probs

12. Re1+ or Re1+ any time seem to help so yeah because the king can move then move back? Still a horrible position but saves the mate

I see tygxc thanks i needed to take that d4 pawn right away but even then once his knights start moving forward my position with the black bishop back there breaks down