Anxiety is a very modern term, so let's avoid that.
What you're really talking about is Fear; and fear leads to discouragement, and discouragement leads to self-defeat.

If you don't want to be afraid of something, then you either have to deal with whatever it is, or altogether avoid it.
There are some things that fear is trying to help us battle against, and some things where fear is saying we can't contend with those things at-all, so we should get away from those things.
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- For your job, and your future in-general, it sounds like you are either afraid of losing it, or afraid it's not earning enough, or going anywhere, or afraid it's not what you are supposed to be doing with your life.
If you don't feel good about it, you should make a plan to build something else that you can feel good about.
- For marriage, I'm 32yrs old, and I tried to get married a few years ago, but it was to the wrong person, which caused more grief, so don't get caught-up in thinking it's about settling down.
If you feel compelled to find a companion, then that's an earnest desire, but it's not something you can force.
In order to find someone, like that, it's just like a marketing activity... you have to put yourself in front of the right kind of traffic, with the right kind of people that you want to connect with.
Try going places, and joining groups, where you meet new people with similar interests.
The person you find will not make things more complicated, but instead they should make things easier and more bearable, and be a force of encouragement in your life. 
- If you don't like to work, and are lazy, as you put it, I think that just lends to this theme you've described of being discouraged about various things in your life.
You are clearly unhappy with certain things in your circumstance, but just remember that circumstances change all the time, and so your mood about things should not be so easily broken.
It's good to be prepared for the worst, but you can't just spend all your time mourning over bad things that haven't happened, yet. (LoL)
In life, we will suffer loss, and only a fool has no regrets, but despite all that, we should pursue wholesome goals each day, and if we make an effort to do that, we will achieve the things we set ourselves to do.
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So, I would encourage you to set some practical goals in the areas where you are suffering from fear and discouragement and a spirit of self-defeat.
Your circumstances can, and will, change for the better, if you set practical daily goals.

Set goals for a job you can enjoy.
Set goals to meet new people, with similar interests.
Set goals to work on things you believe have value.
Set goals for things rooted in Truth, and you will have liberty from fear and doubt and discouragement and self-defeat.
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May you find good work and companionship and unbridled joy,
Ivan
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