1. Ok, lets add narcissism to the list of things you struggle with, ist actually not as unlikely a combination as you might think. Narcissism is just pathological self involvement and a need to seek affirmation of your self image from others so i suspect its common in incels. Actually, another neat thing, there are 2 types of narcissism. There is narcissism where your self image is positive, and where you seek complements from people, but there is also narcissism where your self image is negative and likewise you seek conformation of this image from others.
2. Therapy is not a high when done right, it doesn't constitute of just "making you feel better", but rather fixing your mental processes. You're dismissive of it because of your personal complexes or maybe a bad experience and you need to stop being dismissive of it if you ever want to get better.
3. "Ad hominem" is a personal attack, for an instance if i were to call you ugly or stupid. Its necessary direct.
4. You absolutely have something to gain from pretending, its mental comfort. That's what defense mechanisms are for. You're attacking your perceived root cause of the problems in your life because you want those problems gone.
Childless loser, another projection, again fits into the model like a glove. Look. I'm not typing it out just because im bored, im trying to illustrate to you how and why you think and do the things you do. Because the first step in overcoming those problems is acknowledging they're there. If you think you don't have a problem you wont seek help. But you do.