Wanting to be a Therian only to fit in with friends or be in a pack can not make you a Therian. If this is why you are in the community, then you really need to dig in deep and ask yourself some tough questions because this isn't a fandom or roleplay. Also, you can't force a person to be Therian just because you want a Therian friend.
I will also briefly state here that anyone can wear a tail or ears. Wearing these accessories does not make you a Therian. People do trick themselves into thinking that ordinary, mundane events are related to Therianthropy or shifting.
I recommend reading up about Shifter's Disease. http://therian.wikia.com/wiki/Shifter's_Disease
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How to Determine if You are a Therianthrope
Non-FictionThis document will help you decide whether or not you may be a Therianthrope. It covers common experiences for awakening Therians and some stuff to be aware of. You will also be introduced to a few helpful techniques to get you started on your path...