Some people are generally intellectual. They are born with brains that will allow them to think very well and will enable them to make new things that have never been seen or tried before. This time, you can become intellectual by learning more books. You may not realize this, but reading more books will allow you to keep on learning.
When you always feel the need to learn, this is the time when you truly become an intellectual because you understand that you do not know everything. There are still some things that will be new to you. This mindset will always make you curious and ready for anything.