Im not ready for the responsibility of a serious job I dont know if i can do it?

Im finishing university soon and ive been applying for some career related jobs. Im doing well with interviews and i have a few options i can chose from like big banks and other firms. The thing is, i really dont want to work a serious job. I know it sounds childish but i just dont the idea of it freaks me out. When i was 18 i had a very serious job in client relations but it made me really anxious and wearing that stupid suit just got me so depressed i had to quit after a week and then went to university and got bum jobs (like handing out pamphlets) i was more comfortably with even though the job i quit paid double the money and had great potential. I have great jobs lined up for me, but id rather work as a mail man or something. I wish i did design or something.. i want to be a musician.. but neither are financially stable and its too late im already almost done with my finance degree.. I know i have to get serious now and get experience in my field im just afraid i wont be able to do it again. I love uni.. i dont want to leave but i have to make money some time and id really like to have lots of money some time soon because i love shopping and buying nice things and being financially stable makes me comfortable. Can someone give me a piece of advice?