When i close the door on my 95 chevy corsica it doesnt close. it just bounces back. please help im a girl and my parents dont know so use small simple words please.

The latch may not have opened all the way on the door part way down is a small opening looks like a sideways V that when the door opens should be unobstructed can slid pencil or finger in-- if the latch came down ,sticking or failed their will be a small bar looking like a C across the opening--- if the opening is blocked take a pencil or something hard and lift the outside door handle and push the latch [the little bar blocking the sideways V] towards the inside of car it will move upward out of the way now close door should close later spray latch with a lube or if spring failed will need to replace but for now u will be able to close and secure door

I think what has happened is that the door latch (the one in the door) has somehow closed and won't let the door shut normally.
Here's how it works. The door latch consists of two major parts. One is the short, round metal tube thing that is attached to the car body about halfway up where the door shuts. Inside the door there is a latch in a slot that lines up with round metal tube thing when you shut the door. I think what has happened is the latch has closed, not allowing the door latch to slide over the metal tube thing and close completely. If you look at the latch in the door slot you'll (hopefully) see what I mean. Now how to fix it.
You'll need a medium to large screwdriver and maybe some help from a friend. First, lift the outside door handle like you are going to open the door. Hold it up. Then, with the screwdriver, push the latch in the door slot UPWARD until it clicks and latches.
It is difficult to put this in words but it usually is an easy fix. No damage done to your car (unless you REALLY slammed the door hard numerous times..).
Please re-post with any questions.