I often feel the same way, and at times even feel wrong thinking it given my $$, job, and status. I almost feel ungrateful feeling that way, but that's beside the point.

In my case, I tend to feel like a loser when I'm exhausted from doing things I don't particularly enjoy, and neglect the things I do. For example, spending countless hours doing a job that doesn't particularly excite me (but still do it well), and neglect my favorite activities such as playing soccer, dancing, or going out with friends. Then begins the spiral loop of wondering "what you have achieved", and looking at what others your age or younger have done. If that's how you feel, you're not alone and thankfully there are ways to break that mentality :)

When that happens to me, my best approach over time has been to pause for a moment, take a step back, and reflect on my situation. Realize that at 25, having $$, job, and status is actually "quite an achievement" that many others wish they could have accomplished as well. Realize many of the things you take for granted, like eating every day, having access to water, are a dream for some in other parts of the globe. Being able to afford what you desire for the most part (except maybe that Lamborghini), is a dream for many for many within the country. All in all, on an absolute scale, you're definitely in a pretty good spot and by no mean a "loser".

At that point, I usually feel better about myself. But that's only a temporary fix, because the underlying issues are still there. Rethink your priorities in life in terms of what provides YOU happiness. Forget about what society and movies make you believe priorities should be, and think personal. A quote I really like on the topic, from fight club, is:

"God damn it, an entire generation pumping gas, waiting tables; slaves with white collars. Advertising has us chasing cars and clothes, working jobs we hate so we can buy shit we don't need. We're the middle children of history, man. No purpose or place. We have no Great War. No Great Depression. Our Great War's a spiritual war... our Great Depression is our lives. We've all been raised on television to believe that one day we'd all be millionaires, and movie gods, and rock stars. But we won't. And we're slowly learning that fact. And we're very, very pissed off."

Now don't get me wrong, it is possible you genuinely have a personal goal to become a movie star, which would make you the happiest person on earth (but again, that's beyond the point). So think hard about yourself and what really motivates and makes you happy, and reset your priorities. Maybe it's worth not staying as long at work, fix that bug tomorrow, and go play that soccer game you've been craving for. Or maybe instead of spending an afternoon going to some event you don't really want to go to is better spent hacking away this fun idea you've been wanting to do for a while. Whatever makes you excites you, make it and priority and find time for it. The rest really is secondary. In my case, after a while I decided to make the bold move of quitting my job for another that pays less, where I work longer hours, but that is oh soooooo much more fun. I'm loving it and am super happy learning great stuff on a daily basis, and being payed doing what I like. We're all different, so it's up to you to find what your thing is :) Good luck, and I hope if you got this far my answer helps.