How to keep retics on the smaller side? (Mainlands)

[Bluebonnet Herp]

But I can't handle more then 10-12 feet of snake (I am not even 5').

Good thing there's at least 30 or more species of pythons and boas that are under 10 feet long, amirite? If you really want a retic, you'll find it worth your time to save up some money for the dwarves.