Credit Card No Credit Discover

I just received my credit card discover student and spent $ 45 is that you can?
Ok, so I can not get out of control, but I am super excited that I finally got one because I have 18 years and it is hard for people my age to get a credit card without credit. my limit credit card is $ 250. Today so far spent about $ 45. is that you can? I spent some makeup and personal things I needed. Just need to know I'm not losing control, I get a very good credit, but I have an addiction makeup and always have to buy it.
The important thing is to ensure you pay when you get it off the bill.
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