A lot of the issues you have could be the result of a distorted life perspective. Superficial advice like "lift weights" are not helpful. You need to change your thinking patterns to have results that last.
It makes every part of your life easier.
- Releases endorphines to make you happy
- Makes you more attractive
- Helps you burn more fat
- Helps your long term health
- Gives you something to put into your routine to have a healthy habit
- When you do it and stick to it, the downside is you have to listen to occasional ignorant comments by people who downplay the benefits of this.
- Your sex drive increases
- Testosterone / you become more dominant
It's not easy either - lifting weights takes a lot more effort than jogging. You're more likely to be characterized as a brute jock, as opposed to biking / jogging where it's all glib hipsters.
I'm not saying it's bad to do it, or that it won't have benefits, however it won't magically solve deep seated problems like bad thinking patterns or a distorted life point of view.
As a complementary activity, that's great but should not be taken as "the solution", because it's not and could be misleading for people that need guided therapy.
It's similar to people with eating disorders. Telling them "just eat healthy and work out" won't help them ( they have heard that for years). They "know" that they could eat better and they know all the benefits of working out but there are deeper issues / fears/ misconceptions that should be treated first.
Don't take it personal, just be aware that is not that simple.
"- Testosterone / you become more dominant"
You can be 5 feet tall, built on a cat frame and still be dominant. Being dominant is much more about how you interact socially. And no, being the 'tough' guy doesn't help.
You can feel more confidant if you have some more muscle mass, but that's about it.
Now, about the testosterone. Exercise will make your testosterone go up for only a few minutes to an hour, which doesn't do much of a difference. (Same for sex btw; levels go up AFTER sex.) Besides, if you lack the hormone in any serious matters, you should seek a physician. Other than that, why would you want more? Because you think it's in direct proportion to your manliness?