Rep Power: 0

Hey everyone I recentley bought a 99 civic ex just as a gas saver and cause i wrecked my bike :/ but Ive been having some problem with it like today and I'm not real sure about this car so I would like to know something....this morning i went to go get coffee cause its finally cold here in Texas but i walked out the store started it up put it in reverse and it didnt want to go..I put some gas into it and it started to go but it seemed like it was stuck so i tried neutral and same thing put it in drive and it went forward...just wont back up no the e brake is not on and its an automatic what could be the issue??