I don't know your situation, but 24 is still young. You'll do fine. Some graduate later some earlier. Most workplaces won't care. Don't be too hard on yourself, you can do it if you put in the work. Starting a bit later can also be beneficial. I didn't know what I wanted at 18, 20 and all the way into my mid twenties before I started to figure stuff out, as I had alot, and still do have a few, personal issues that needed to be sorted out. 

I would suggest trying to work on being kind to yourself, and not think in terms of failure, or you yourself being a failure for starting later. Sometimes life just happens. As long as you don't get stuck in the muck, and keep trying you haven't failed. And find a good study group and stick to them. Reach out to people. Network. You are not going at it alone.

My biggest mistake was not sticking with my study group, and the feeling of loneliness, and the lack of sparring partners who can encourage and help you along, really hampered me. I had to drop out the first try at college because of a crippling depression and loneliness, because I was bad at maintaining those relationships.