When people say you have an attitude issue, they are not talking about pessimism versus optimism. They're talking about enthusiasm for being part of a team, and cheerfully taking on tasks, and eagerly going into an interview as a challenge that can get you into a team, and enjoying the company of other game developers, and many other things besides just optimism or pessimism.
We're not talking about pessimism or optimism. "Attitude" is much more than that. You can have a positive attitude despite your lack of optimism.
When people say you have an attitude issue, they are not talking about pessimism versus optimism. They're talking about enthusiasm for being part of a team, and cheerfully taking on tasks, and eagerly going into an interview as a challenge that can get you into a team, and enjoying the company of other game developers, and many other things besides just optimism or pessimism.
We're not talking about pessimism or optimism. "Attitude" is much more than that. You can have a positive attitude despite your lack of optimism.
That, +1000.
When I moved from my original QA position to lower management levels, I was under-skilled and had absolutely none of the checklist items they were looking for (I'm pretty sure there is still a thread around here to attest of that!) but I came through the door like a champ and they decided I was worth a shot. They didn't even cringe on salary and gave me the full package for that position (to my amazement). The following weeks, I kept my positive attitude at all times despite all of the failed experiments because I was learning, and nobody realized I was making mistakes simply because I was keen on fixing them.
To sum it up, I was terribly underskilled but I came in with a motivation that could wreck mountains and they chose me based on that alone. That was a stroke of luck, but you make your own luck. In the words of a famous Canadian hockey player: you miss 100% of the chances you don't take. Go in, see it as something you can win, tame the beast and score. Fail? So what? You've got tons more of interviews to score!
As you're pointing out yourself, getting interviews doesn't seem to be your problem (to most, it can be, and I've done my best keeping a very high score rate on mines because we don't have many available jobs locally so we don't have the luxury of lining up interviews) scoring is. And you can't score if you won't even start believing you can.