Please recommand me an antihistamine that i can take before i go somewhere that has perfume (i have perfume allergy). i am 16.

Where?: Where ya gonna go where there's no perfume? Maybe the zoo (no, that's a bunch of other "per-fumes..."). Have you been tested for a true allergy? It may be a sensitivity to a particular chemical and not allergy. Anyways, Benadryl (diphenhydramine) is the standard. It makes you drowsy but a cup or two of coffee usually beats that. There are drugs like Zyrtec or Allegra, but you'll have to find out what works for you