Two different issues here.
1. Are you a loser?
2. Are you perceived by others (women, say) as a loser?
The answers are likely different.
Some (not all) women will find it odd and not normal for a 30+ year old guy to be living with parents. There’s somewhat of a stereotype of mama’s boys, can’t leave the nest…that a guy can’t survive on his own. The movies have made billions on the mama’s boy plot line.
If living by yourself is perceived by others as a testament to maturity, independence, and reliability, then living at home doesn’t help those perceptions.
But again, there’s a big difference between reality and perception. You may have the soundest reasons, and the strongest personality – you may be the opposite of the stereotype in reality.
But outsiders may, possibly, perceive the opposite.