Use Mattermark.com to find them. They have a 14 days free trial. The tool will let you filter by founding and type of company, so it will probably give you what you need.

Suggest you search the CrunchBase database. It lists all the funding publicized plus many startups list themselves there.
https://www.crunchbase.com/

You can find my listing!!

I have a lot of experience with people who are just getting started and are not yet funding.

You can find many of them through databases of accelerators that don't provide funding (as a first step). It might also be worth it to do a bit of recruiting of these startups depending on what you intend to do with information.

I would be happy to talk with you about this and give you more information once I have a deeper understanding of what you are trying to do.