trouble with black openings

I was wondering if someone could help and give me a sequence of moves i  often seem to get myself on the back foot  from the start when opening with black and its always the same moves i dont seem to get the answer for  for example  white starts with e4  ,nf3 my open is e5 and nc6 then the move i have problem with is when white plays d4 whatever i reply with seems to put me under pressure form the start and its starting to get to me as against better players you cant always fight your way back into the game when you start badly !!

So you reply exd4 Nxd4 and then what do you play? 

Bc5 Be3 Qf6 c3 maybe?

I would go with exd4. You get an open e file and white gets an open d file. Any other response is to passive. Even bringing the bishop to g4 to pin the knight is just a delaying move. As far as overall positional themes, you will need to study the scotch games.

You can take the pawn with exd4 but under no circumstances after 4. Nxd4 play Nxd4 back, since that sticks the Queen in the middle of the board (it's most powerful spot) and you'll never get rid of it.

Is this the followup?

Yes it was the followup , i won the game still but against better players a bad start usualy means defeat

 Scotch games ?

The opening you described is the Scotch game: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4. The best moves here are Bc5 and Nf6. Qh4 is often played with an eye to grabbing a pawn, but it is juggling dynamite.

You might want to start looking that stuff up on databases etc.  

Thanks for that spudnik ill go take a look :)

what you mentioned here is a scotch game.

you can find the theory and study it here:

http://www.pgnmentor.com/files.html