First off....ya just need to understand that the learning curve is difficult. Secondly...as others have stated...try to find a group (Squad) of folks with whom you may have some rapport and fly with them for a bit and gleen them for any and all information possible about the game in general, and about flying aircraft in general, and about specific aircraft that you wish to learn.
When I subscribed to Aces High, I specific things in mind: 1) I wanted to learn to fly the F4U Corsair in all of its varients. 2) I sought out Corsair specific Squadrons and went to their various websites to determine if I "might" ..."fit-in"...with their style of flying and fighting in the game. 3) I selected a Squad that met my needs and requested acceptance. 4) I then proceeded to spend a multitude of hours in the training arena learning the intracacies of the F4U in the attack and fighter modes so that I would meet, or hope to meet, the expectations of my new squadmates, all of whom have flown a gazzillion, or more hours, in an F4U than I...and on my very first Squad Night I was sweating buckets for fear that I would let my new-found Squaddies down.
Since you are getting frustrated at being shot down so much it seems to me that you have the sand to stay with this game(sim) and to wreak hovoc upon those who have taken advantage of your inexperience. That, Sir, is a foundation upon which you can build. Don't let frustration and inexperience blind you...take hold of the challenge and strive to improve your skills by utilizing the opportunities afforded you throught the help files, the training arena, and through fellow players...
And, if you are interested in learning to fly and fight in a Corsair, please look up the Green Mountain Boys.
Good luck and best regards,
Patches