I think we've all been there at 1 point or another
Here's a few tips:
1. Always clear your tail before attacking (TAC and/or visually)
2. Stay high in the fight
3. If your opponent dives, let him go (esp. in a tight dogfight)
4. Gain tactical advantage before attacking (height & numbers)
5. If you get damaged, turn & go home
6. Protect your wingmen (the more of them around, the less pressure on you)
7. You can be more aggressive on your side of the lines, but when crossing into enemy territory, be more conservative
Best method is to attack the highest opponent, drive him down
...then hit the next highest guy, etc.
The victories will come, best not to worriy about them til the OFF Manager rejects your claim
HTH,