The adjective worth is never followed by an infinitive. Use th | English as a Foreign Language

The adjective worth is never followed by an infinitive. Use the pattern worth doing something:
Is it really worth to spend five years of your life studying?
Is it really worth spending five years of your life studying?
The subject is definitely worth to discuss.
The subject is definitely worth discussing.
Note also that the active form of the verb is always used, whether the meaning is active or passive. You can say ‘this is worth thinking about’ or ‘it is worth thinking about this’:
History is a subject well worth being taught.
History is a subject well worth teaching.