To respond to my question about not being happy about life?

The reason we purchased the house was because it's the family house and I bought it from my siblings. Also, it's the only thing I have left of my parents and grandparents. It would be very hard to sell it because it means too much to me. About getting a 2nd income, I just got fired from one that I had in an office after only 2 months because I wasn't fast enough for them and I didn't know everything about the two small companies that I was working for. Apparently they expected me to know everything in a couple of weeks. I did not work in an office in 16 years because of raising my family. Now I regret being a stay at home mother and I also had 2 part-time jobs, 1 delivering newspapers for 6 1/2 years until it was no longer profitable, the other one I am still working at but only 10 hours a week. It took me 2 years to find this office job that I had for 2 months because I wasn't perfect and made mistakes that I immediately fixed. I went back after my 2nd job if they needed something done. So yes, I feel this way because every single time I try to make things better they get worse. For the person who wanted to know where I live, I live in Massachusetts and I was looking for a job near my home(20 min. from Boston) because I did not want to leave my other position until at least school ended(it's school related and the kids don't get out until the end of June). I was finally excited about something and once again it all went wrong. I try real hard and constantly seem to fail with what ever I do. Also, if we sold this property, I couldn't live with myself and the rent around here would not be much less then the mortgage. We would be living no where anyways and moving far away would not be a great decision because our 2nd son is a junior in high school on an IEP(educational plan) because he has ADHD and learning disabilities and that situation would hurt him more. I guess what I really want to know is why can't owners of small companies give warnings and tell you what you are doing wrong before they fire you. If I didn't like the job, I would be expected to give a 2 week notice. It really doesn't seem fear because I was working really hard and giving it my all. I was budgeting and trying to save this paycheck so we could try and climb out of debt but apparently it wasn't in the cards. This is why I am so discouraged, because I am not lazy, I tried real hard and failed. So I feel like a failure because anything I do seems to always go so wrong. I do not even know if I have it in me anymore to go on interviews. I use to get excited and hopeful but I do not think my confidence can get any lower. I probably won't ever hurt myself because I wouldn't do that to my sons(maybe if I didn't bring children into the world). My husband is in to his hanging with friends and doing his own thing most of the time. I was looking for something more since my kids are grown. Getting this job was suppose to give me hope and confidence in myself, now without it, I am at square one. Remember, I said I can't sell the house 1. because to me it's a family heirloom 2. Rent is almost as expensive. And I can't find another job, this one was the 1st one I got offered in 2 years of searching and sending out resumes. This is why I am so hopeless. I try to make things better, get excited that things are going to be okay and then constantly fail. I honestly do not think I have it in me anymore. I just feel numb and extremely worthless.