hi,
Firstly i have to say that i really think that you are not 'thinking to much' as you put it! it is good to hear that men have the same anxiety/stress/worries about sexual performance. As you said your wife is honest with you, well in that case you should listen to her and believe what she is telling you- it doesnt matter..
Although sex is important to women and men alike, what is also very important to women is support, pyhsical and emotional, love and happiness. and i would imagine that your wife would think you were 'less of a man' (as you also put it!) if you didnt provide her with these things rather than the sexual side of things. Another thing to remember is that regardless of wheather or not you give your wife sex/sexual pleasure it is likely just as satisfying that you try, and it seems that not only do you try but you try hard to please her and to make intercourse enjoyable and satisfying for her.
ok it is a problem, for you, but lets face it, its not the end of the world, you still bring her to orgasm through other types of stimulation so she is still being satisfied.
Now on to you,you should not have to just bit the bullet,i am sure there are things out there that could help you... have you seen a doctor about this problem? or visited websites to see if there are people alike and some solutions? although you did not mention this in your thread for some reason i would imagine you have....is there anu solutions out there?
Would viagra help?
you say it is difficult for you to reach orgasm through hand and mouth,well i dont know if this is an option you would have considered but would you try using sex toys for more stimulation and to help you reach orgasm?