Yes, you can use Donorbox to raise funds even if you are not a nonprofit organization. Many for-profit businesses, big and small, have raised donations for charitable causes or research projects. You can even register as an individual for your personal causes.
When signing up for your Stripe account, please choose the Individual / Sole Proprietorship option as the "Business Type" if you are an individual raising money for personal causes.
This is the option many people use when they want to process transactions as an individual and not a registered company. You can check out this article to learn more about the process or feel free to contact Stripe.