Lexy, you are not alone.
I was once 24, and your experience is very familiar. The early twenties are difficult. However, they pass. I will offer one piece of advice, which I think is the best advice there is. In any case, it worked for me. Learn to be happy, all by yourself. Learn to be happy regardless of the kind of job that you have, regardless of whether you are in a relationship, and regardless of whether it might look like your life sucks. This is what I learned. It takes time, but it is doable. You just need to learn that you have the power to be happy, and that power is already inside of you. Once you know this, really know this, your life changes. Remember, learn to be happy first, without anything changing in your life. As crazy as this may sound, this is what works best. Happy people have better relationships and they are generally more successful than other people. Happy people find life more meaningful. The best way to learn to be happy is to learn meditation (real meditation, not brooding and not rumination). Learn it and practice it regularly. Learn to find the real happiness that is your true nature, and then let your life expand outward from there.
Good luck.