Is x-country for me? help soon!!?

ok so i have been thinking about doing cross country for a while now. now i really have to make my decision. i have never done cross country or track before. i also have not really been running that much over the summer. i have gone on the occasional run but nothing regular since i have been so busy with different camps, etc. i have been very active over the summer though and do something active everyday. although i havent been running everyday, i have done things like long bike rides (up to 50 miles without stopping with many hills and different types of terrain) and volleyball, things like that, so it isnt like i have just been sitting on my all summer. i dont know if these types of things help at all. i am also healthy and have a healthy weight. i am tall too if that helps. i can run 3 miles straight (that is the longest i have tried) but i didnt time myself and i dont know how fast i am compared to other people. do you think that i should try it or do you think that it isnt worth it? should i just not do it at all, should i just do it or should i go to the first practice and see how it is although i dont know if they are gonna let me run since i need to get a physical?? my friend who is going out for it thinks i can do it but she has never done it before either and i want some other peoples opinion.