i cant do romantic interactions on sims 4

You can't do Romantic interactions during the tutorial. The entire Romantic menu is disabled until the tutorial is completed.

I don't know what would be preventing Romantic interactions when you aren't in the tutorial. They should be available for Teens with most other Teens, unless the Teens are related. They should also be available for Sims who are Young Adult or older with most other Sims who are Young Adult or older, unless the two Sims are related. There might be some special Sims with limited interactions that don't allow romance but I expect you've tried with enough other Sims to eliminate that possibility.