No, that's a terrible idea. Studies show that the younger a couple is when they get married, the more likely they will be to get divorced. This is partially from lack of maturity, the brain doesn't mature on average until age 25, and the Millennials, as a group, are far behind that average. Plus this is due to lack of experience with relationships. And they don't know how relationships work in the first place. There is a science behind relationships. From studies of successful and unsuccessful couples we know what works and what doesn't.
This link will give a lot of detailed tips. https://pastebin.com/GQ3a3F8v
I have a long time interest in psychology, specializing in relationship dynamics for 30 years.
(Please note, we give the best advice we can based on the information given in a post. For better advice, please include the age of all romantic partners.)