Is it possible for me if i switch my religion to Wicca?

I don't think there's an official process of conversion. If you really want to become a Wiccan, then do some more research, find fellow Wiccans in your area, and go from there. Also, who cares what your parents think? You're old enough to think for yourself, and it's your life. May I point out that you don't need any 'powers'. If you love nature, then there are other ways of expressing that, rather than following a religion that is mostly fictional and imaginary.