My battery Keeps on dying

I have a 93 toyota camry and I am having some problems and I have no idea what it can be, well my battery dies in two weeks when is fully charged I bought a new battery and a new alternator and the car still does the same thing every time I fully charge the battery it dies like in two weeks or less, some people tell me it can be a short and others say it can be a relay ( I dont know if I spelled that right). But I dont know what it can be and I get scared to take it to a shop because Im a female and some people take advantage of ladies not knowing much about cars.
Please someone help give me ideas on what it can be or what I can do to find out.

Thank you so much

Vanessa