I feel stuck and dissatisfied and don't know what to do?

I know millions of other people probably feel exactly the same but I have been feeling this way for about 4 years and desperately need change. I am 27, in a boring dead end admin job and constantly skint. I don't have much of a social life, I'm a single mother so I don't have the time or the money for one. I have dreams and ambitions but they seem completely unachievable given my circumstances, for example my dream job is to be a travel journalist. People say money doesn't buy you happiness but it would certainly improve my life a million times! I'm so bored of just working in a job I don't care about and not having a life, I feel like there's something much better out there for myself and my daughter but I don't know how or what to change.