That’s too young to get married. You never learned to be alone.

Embrace the fact that this is an opportunity: The wall is now empty, you can draw anything you want!

Focus on yourself : Read books, go to gym, eat healthy/cook

To socialize : meetup or equivalent, sports with people/hike

Do not date. Do not get on apps. Do not hook up.

Minimize drinking.

Read psychology and philosophy. Do not read self improvement books.

Give yourself time, it fixes everything.

Once you are happy with the person you have become (i.e. you look back at this post and realize you are at a higher level of consciousness) you can date.