Ok first lets talk about one man startups:
Jeff Bezos - Amazon
Elon Musk - SpaceX
Larry Elison - Oracle

Sound familiar? Some of the most incredible startups have been started by one person!

If you don't have the skills, you need to either learn them or convince someone else to join your startup for some equity in the company.

If you don't have the time for investors, then consider joining an accelerator program. If you are accepted they will give you some initial funding so you can free up your time to run the startup and talk to more investors.

Everything has a trade off. As a one man startup you have 100% ownership in the company. With two founders you might have 50%. Sometimes founders will find another co-founder for their first startup. Then after their first startup is successful the next one they do they may do it alone.

Don't give up!