Wow! You sound like me when I was 30! I could relate to your post. But there are a lot of things that I think you have discounted about your experience in life so far:

1 - as far as marriage goes, you learned to move on instead of being stuck in marriage that was not good.

2 - you are in college which in itself is a big accomplishment. You have also learned what the market for your degree is in before you graduated. I think that library science is a wonderful basis to start your career with. This gives you an opportunity to think outside the box... maybe you can apply your skills in related career. I've even seen some people who went into career fields that didn't have anything to do with their major (an agriculture degree and went to work for IBM). You can also market yourself to places like museums (they have libraries within their own infrastructure. The possibilities are endless.

- I know you have wanted a family and a nice house. A good dream. There is no reason that you cannot have that. You are 30, I know people that didn't start their families until they were in their 40's. As for the house, use your degree to get a well paying job and buy your own house.

-Never discount the possibility that Mr. Right just hasn't come along yet. Sometimes love finds you! Give it a chance.

As far as tone of your post (and the part I can relate too), it seems that no matter how you look at something, it gets filtered through the grey cloud/screen of depression, so by the time the awareness gets to us, it's negative. Perhaps you could step back and see if that is what is going on with you right now. Maybe it is your depression distorting reality in a dark way. Maybe you will discover that with a few adjustments (if you are on meds, maybe check with your pdoc to see if they are working or not). Perhaps you need some therapy to see the distorted ways we sometimes think and what we could do about them.

I think you have a lot going for you. I know you cannot see this right now, but be loving and forgiving to yourself, especially when you see everything as a failure. I can see by just reading your post, that you already have a lot going for you as well as your ambition.

I think it's also important to stay in the moment so you can appreciate the small accomplishments too. Why? Because it's important to realize you are living life... enjoy the lunch you have with your friends, realize that life is a journey, not a destination. We are human beings, not human doings.

Life is a classroom, we are it's students and it's teachers.

Stop looking for reasons why your life seems so negative, and look for reasons why it is positive. I was looking at a post this morning and it was about the good things in your day, asking, what was good in your day. And I am sitting here at 8:00 am and the first thought that came out of my head was I woke up. What I did there was realize that I get another day of living life.

Sometimes we think we are more in control of our lives than perhaps we really are. We work so hard to fight was is going on around us instead of trusting that perhaps what will happen, is better than what we planned! I find that happening in my life a lot lately. How did I come to appreciate this... all by letting go. I am not saying give up and walk away, but recognize the things in your life that you can control and what you can't. Sometimes walking away, we are not giving up, we are moving on...

I hope that the clouds will open up for you so that you can see how wonderful life can be.

Be well!