Should I question my wages?

I'm 16 and I've recently started working at a shop. I get paid £4.48 an hour which is slightly above minimum wage but a lot of people are saying its low and especially compared to their jobs so I'm beginning to question it. I really like working there but for 8 hours a day, constant standing and I'm not being paid worth my while, should I do something? if I'm being mistreated or confused should I question it? Or just leave it...?