Hi Maryam,
It is possible to visit Africa and work in a village or community. A couple of friends of mine are going in February to a small village mainly populated with orphan children.
You should do some research. Find an organization in your area that supports efforts in Africa. Reach out to them to see if they can help you organize something, or connect you with an organization that provide trips for volunteers. Also, look into mercycorps.org. They may be able to locate an opportunity that suites you.
Good Luck & Peace

Anna