I wouldn't rule out Primark straight away
Me and jeans fall out all the time, cause they just don't fit the way I like. I only wear boot cut jeans, as they are the only style I find suit me, the problem is im a 28 waist, which means one finding jeans is tough enough, but to get them bootcut, and fitted is a challenge....went into primark, bang, found 4 pairs of jeans, all perfect for my requirements...ok so the cut on them isnt AMAZING, and the wash isnt either, but if youre looking at topman, and burtons...youre not gonna find anything better there, until you start pushing the £70 mark for jeans. Take a trip to primark again man, and try on a few different styles of jeans, dont just be tempted to go for the straight cut...see which style you prefer, and grab a pair...then try them on with some different shoes, and tops...youll be surprised how a different pair of jeans will gorw on you with different clothes to the ones you wear when trying them on in the shop. the other reason youll never go wrong with primark is that, the jeans dont ever seem to be more than £8 haha
by the way, I dont work for Primark lol.
Do try h&m too...I dont have any experience with their jeans or trousers, but I do have a lot with all their other items of clothing, and it is all top notch. if youre just after plain base tshirts, they go for like £4 in there...I bought a load in a few colours, just to get some base colours to wear with other items. Make sure the h&m you go to has a guys section though...a lot of them are only female shops.
River Island is a fairly all round decent shop, a lil bit more expensive, but a lot more range...not just what you see on 50% of the people youll see walking around town, so thats always good. Go there if you have a more refined idea of what you're after.
I've never found what Ive been looking for in next so gave up, but believe their sales attract some serious attention, so maybe have a look a couple of days before a sale....then get queuing.
Burtons and topman I just dont go in anymore, as I guess Im not one for wearing a tshirt to town, then walking past 7 other guys on the high street wearing the same top as I go for a drink lol, but thats just personal opinion.
Best advice man...get yourself a job, get som more money in your pocket, open up your options