You might not be asking for attention, but you're going to get some.
Normally I wouldn't address people in this way, but I'm making this an exception for your own good yeah
.
Firstly, of course you're not useless. Useless people end up in prison, or become tramps, so stop talking dick about yourself. Unless you see the positives in yourself, (almost everybody has some), you will never be more of a person, you are certainly capable of being.
So you're a bit slow on a course, doesn't matter. You can get there, if you believe you can. Unless it's run by crappy tutors, that can't do much more than teach people to spell their own name, well then you might have issues, otherwise you're potentially creating issues you don't need, so just stop it man okay.
Yes your parents might be doing something to limit your good food intake, but things take time. If you keep putting the right kind of effort in where you can, you'll increase your chances of doing well.
The buck stops with you fella. Parents might not necessarily be helping much for whatever reason, but then you evaluate and adapt the situation accordingly, to suit your needs as much as can be.
You need to start realising, the person you are is worth something, not just to others, but to yourself, or you'll end up some kind of deadhead alcoholic or someone like that, with no friends and a whole world of problems.
You aren't yet a man, but you need to be more of a man about your whole situation here, because yammering on about parents do this, no part time job, crap course, etc etc, just allows the problems to affect you more emotionally, so stop doing that alright.
If you use the attitude of yes, these things happen, but am I going to let them mess things up for me, hell no, you'll be better off in the long-term.
There's NOTHING wrong with you. Heck there's nothing wrong with Emo's, to the extent that Emo's should have that lifestyle choice. Regardless of what they think, their issues are in their head mainly, I'll bet 99% that's true.
Sure some circumstances cultivate negative thinking, but the person who talks as if these things are a hurdle or obstacle to overcome, are the ones who most often will.
I've known of people who end up 40, or even younger with no parents. Most people could expect to reach at least 50 years old, before losing one parent. For people who suffer things they shouldn't have to, thery could be bitter, and become angry with life, or more hateful to others, but many don't, they simply look at the best of what's left in life, and use those things to promote positive feelings and situations in their life.
Bad stuff in life, might feel bad and sticks in your head for years and years, but at least it serves as a reminder, not to end up in that situation again, if you can avoid it, so some positive does come out of a lot of bad stuff.
Until you start seeing yourself, and the world around you in a more positive light, you'll continue to use every little thing to beat yourself with and feel crappy.
Take more control, be more of the person you can and deserve to be, and stop acting like some little kid, who's best friend has a better bike, your parents can't afford. Someone who has positive things in life, but overshadows it with bad thoughts and words.
Remind yourself what sort of person you can be. A decent guy with a pretty decent life. You're not a worthless bum that no one cares about, so wake up and see the sun in the sky man and stop living under a damn cloud yeah.
You CAN do this, and you CAN make it work, but how much do you want it, and what CAN and WILL you do to make that happen?
21g protein, 11g fat.
It's frustrating because say i had great nutrition 100% of the time im sure i would of met the goals i wanted by now 
