A job gives you experience which you sometimes don't get with a startup - co-workers will know stuff which you haven't even touched. So joining the workforce has benefits as well.
Make sure you do your market research to make sure that what you're building is actually relevant. Very often people just start building stuff to solve a problem which doesn't even exist for most people and then they wonder why they can't generate revenue from their startup.
Also, raising funding shouldn't be your goal, your goal should be to build a profitable business. If you're not enjoying what you are doing and not seeing a way to generate income from the startup, move on. If you genuinely believe you can make it and you put in the hours (don't buy into that 4-hour work-week nonsense), you have done your market research and it checked out, you have the right people to make things happen and with some luck, you might just make it.
Finally, nothing stops you from doing a full-time job and working part-time on your startup, that's typically the safest way to go, unless your startup is already profitable or money is not a problem.