Working retail and unhappy. Don't feel very hopeful for the future. I have a Bachelor's. Dunno what to do? Help.

I'm really at the verge of having a breakdown. I'm sad and feel hopeless. I wish I could make more money but I do what to do. I have experience in marketing and advertising. I guess just continue to apply for better paying jobs but I dk. My goal or dream would be to have my own business and do marketing or even start a clothing line but it feels so far out of reach. I just feel like Im stuck and sort of blew it. Both my parents died from cancer and I'm 30. Ugh.