So I've realised that I'm in quite the rut at the moment and it sucks. All I tend to do all day is go to school, come home, go on my computer, play videogames and watch TV. My diet pretty much sucks (I'm skinny but I eat a load of ♥♥♥♥) I have a bass guitar which I don't really tend to play because I lack the motivation to play as I can't master it straight away. I have no confidence so job hunting is hard, add my fear of rejection and it's worse. I have light acne and acne scars which I can't get rid of. I have no confidence with girls so I don't even bother. And I feel that I'm way too negative 99% of the time.
Are there any after-school clubs that you're interested in?
Try giving yourself a reward for working on the bass guitar. Like put off video games every day until you've practiced for at least an hour, or something. And stick to it. If you learn a skill it should help give you some more confidence.
As for jobs, its hard for everyone, especially students, to get hired lately. So I wouldn't take it too personally if you don't find one any time soon. Especially it being January right now; my store just let go of quite a few people.
As for acne I always used Clean and Clear before I started going to an actual make-up store. I have a green tea face wash that I like from Aveeno, too. If you want to start using products, remember to use a face wash that doesn't contain any medication in it first. Then you can use an astringent and a moisturizer with salyclic acid in it. Don't skip the moisturizer, and I wouldn't go for a spot treatment; it will clear up break outs but it will also make your skin incredibly dry and you'll have to remember to put on sunscreen before going out or you'll burn after only a few minutes in the sun. I find that a moisturizer with salyclic acid in it too works much better for my skin.
Just adding to what Lachrymosa said, since I think the diet aspect is pretty important here.
I don't know what your diet consists of specifically, but from the sounds of it, it doesn't sound like too many fruits or veggies are incorporated in there.
Try having a piece of fruit with your breakfast (or have breakfast at all, if you aren't already), work in some salads, cut back on fried things and sodas. And most most most importantly, drink lots of water. Trust me, that ♥♥♥♥ makes you feel good.
Try exercising more regularly (or at all) as well. Even if it's just a brisk walk, stretches/yoga or some push-ups. Get your body moving.
The only real way to change is to force yourself to make changes that are, in the end, beneficial.
Take it slowly, work some of these things in and eventually it'll become routine.