There is no true way to permanently become fair if colour if you have black skin. The tanning process and production of melatonin is a natural process that takes place in the presence of ultraviolet rays. People with pale skin can therefore falsify this and get darker skin if they do so desire, any many people over do it, causing sun damaged skin often leading to skin cancer. It is however, based on a natural process, whereas skin bleaching isn't natural.
Although there are many products on the market promising to bleach and whiten skin, the skin cells on you face are constantly being renewed, so you would need to constantly be applying product and the result is likely to be uneven and disappointing. I would recommend improving your complexion by eating well and getting into a great skincare routine.
Even if your skin is black, you can still use a sunblock to prevent becoming any more tanned and remaining your natural skin colour.
It is more important that you address why you are so keen to change a part of you that is so fundamental to who you are and where you come from. Bob Marley used to say that if you cut each of us, no matter the colour of our skin, we all bleed the same. No matter what colour you are, you can wear great clothes to compliment your skin and eyes, and wear striking make up.
As a rule, people are attracted to confident people who know how to love themselves. Maybe go on a make up course, learn how to make the best of your features, and realise that everyone is different, I would challenge anyone to say that there isn't something that they would change about themselves, although, you have a life to be getting on with. Please don't wish it away on being something you're not.