Ask yourself this: why do you want a pet in the first place? Is it for companionship? Is it to show your friends that you have a cool pet? Please consider the welfare of the animal before you go ahead and acquire one. Dogs and cats make the best pets for a reason – they are domesticated and tame (mostly). Outside of those 2 animals, some small rodents and fish, I would not recommend another type of pet.
Birds can live for 50+ years and are way too smart to be caged. Reptiles require specific levels of light, humidity, temperature, food, etc. that they almost always die as pets. Ferrets have a novel quality about them that people like, but after a while the smell gets to even the most tolerant of pet owners, and the novelty quickly fades. You should also think about veterinary care – most vets don’t see exotics either for ethical reasons or because they don’t have the experience. If you pet gets sick, there may not be accessible or affordable health care available.
If you have any more serious questions about animal ownership, please ask me. I have worked with hundreds of species in my life, most of which would make horrible pets.