Take a break
Whether you're studying from exams, or taking on extra shifts at work, it's important that you remember to take time off from your responsibilities to relax and recharge. It's okay to not be busy all the time, and to take a step back to say that actually, you need some 'me' time.
I don't know where my money goes, but it always seems to disappear by the time I'm waiting for my next paycheck to come through. But with the money I earn, I know that it's okay to give myself a little reward for all the hard work I've been doing... I've earned that money, so it's definitely alright for me to splurge on that dress I've been eyeing up all month, or go out for the night with a group of friends.
No, it doesn't make you weak. No, it doesn't make you weak. No, it does. Not. Make. You. Weak. Do you get it yet? It's okay to have feelings, and it's certainly okay to show them. Even in public, although you might feel a bit more comfortable crying in the safety of your own home.
Nowadays there is so much criticism over people who are perceived as being arrogant. While of course it's important to have a good balance, it's okay to be comfortable in your own skin, and happy with who you are. In fact, I think it's freaking wonderful!
If you don't want to do something, don't do it. If you don't agree with something, say so. If you're too busy to take on extra work, say no. It's okay to be assertive and set yourself a limit. In fact, it's actually really important that you do, otherwise you could find yourself overloaded with things you don't want to do, or a list of things that you can't do.