Seiously mate, quit yer whining
Had to open with that, sorry
Happy birthday.
To your lamentations - I was 28 sunday before last, work a job I'm bored with and have no idea what I want to do with my life longer term (or even tomorrow). On darker days I feel the years I've spent since uni have been wasted, doing a job which is uninteresting and unchallenging (but pays well, so it rather traps you in a confort zone!), and with no obvious objective professionally. Musically, I just bash guitars and occasionally record them; there is no chance and never was any chance of me getting a sucessfull (however one defines that) band. I just do my thing - I enjoy playing, so I play. I couldnt give a $% about any 'scene'.
I think youre looking at the whole thing from the wrong end, however. You've mistaken not being a kid anymore for getting old. You've been a card-carrying adult for less than a decade, a recognisable sentient being for perhaps 13 or 14 years (I dont count children as real people). There are only, oh, 5 or so times that to go till your most statistically likely time of death. Life happens in stages, chapters, its time you found your next one (I know this because we're in basically the same situation, mid/late 20s crisis :lol: except one of us whines about it more ;))
Stop thinking about the things that you dont think you can do anymore and the things you hate that youre doing, think what it is you want to do, be prepared to experiment too; it wont kill you. Well, probably not. (I'm trying to follow this advice myself, its not easy, but I still think its good advice).
And 27 is no way no how too old to learn to do ANYTHING else. Its a matter of choosing/finding it.