I'm about to graduate from college but still single? Will I find someone?

‘m 21 years old and graduating from college this semester. I see so many people my age in relationships and even getting engaged, but I still haven’t even had a boyfriend yet. I feel like college is the perfect opportunity to meet your potential husband and I missed that chance. After getting a job, it’ll be hard to find people my age to date, so I feel like I’ll just be single forever. What to do?!