Head over to the Opportunities section of Riffle, and find the "open filters & views" button near the top of the project list.
Use the "Opportunity phase owner" filter to search for yourself. This will filter the table to show only projects you own.
💡 Tip: project owners are also considered contributors, so you can use the "Project Contributor" filter to search & find a list of any project you have worked on, including those you own.