I honestly don't think this would work as a comedy :/ The themes are way too serious for it to be funny, also it's a bad example of a shonen manga (shonen manga was invented to educate teens about positive values and morality. Manga like Deathnote and Fist of the North Star were gruesome but they taught important life lessons, your story does not adhere to this.) Even if this is seinen, you need to tone down the themes for the comedy to work. If he were a skilled thief that would work much better, but DO NOT market it as shonen. A manga about earning street cred to bring meaning to your teenage life would only rot the shonen industry, therefore it wouldn't make it past the editorial department. The reason shonen manga is the top in it's field is because it is the most important of all. It teaches youths life lessons and insures good morality in the future generations. So something like this would only bring tarnishment.
I don't mean to be harsh, but I had to bring this to the table. As a teen yourself it must've seemed as an interesting concept, but that's what makes it bad, these things should not be interesting to teenagers. I probably sound like a stuck-up adult but there is a higher purpose to manga, especially shonen manga, and you must keep it in mind when making manga. People who think manga is just time-passing entainment do not understand manga at all.