I am African with dark skin. Should I not be using Retin A? Should I use it with a whitening agent?

I am African with dark skin and Retin A is making me darker by the day-so much so that I'm beginning to not look like myself anymore. Since there's no escaping the sun and I'd really hate to stop using it given that my skin is softer and smoother, should I use a whitening agent? Please advise and what whitening agent is better suited for African skin. Thank you.