Look, look and look some more. Situational awareness, do you keep an eye open all around you? Like Dej said don't get fixated on one target. Do him some damage if you can but don't chase too long when there are enemies at hand. Fly with TAC or any other tools you may want. No need to be macho when you are first learning. Do you have TrackIR? It sure does help the situational awareness. Fly as high as you can manage at all times. Higher elevation than the enemy is a great advantage it also helps in decreasing the accuracy of the AA. As mentioned before use your wingmen. Always lead, select in workshop. You will not win the war. You may survive for awhile. There are many choices in workshop to fit your current skills or to make it challenging. Make the selections to suit yourself and have fun. Know this, we long time fliers have a large stack of dead dudes piled up around our pc's. We got better and are getting better. Practice, practice. Keep at it and you will improve.
Best wishes.