I got a summer job when I was 16. then another one at 17. by 18 I had to start working part-time yearlong (needed the money). You do miss out on some stuff (you cant waste your summer doing nothing like the cool kids ), and it's hard on you both physically and mentally.
In the end it's all about goals. If you really want it badly, go for it. It will make you grow, and you'll earn money of your own However, you might consider working part-time - at least that way you'll have more free time for yourself/hang out with friends AND will still earn a few quid. You probably wont be able to buy that rig, but you might consider a cheaper rig or no rig at all for now (and you'd get to save the money) Besides, you've been playing for 8months - I'd get A LOT more experience and try out other different brands before I would commit to buy such a monstrous rig. Oh, and BTW, do you really need all that power? O.o I've got a 200W head and its more than enough for my small gigs