To dream of the seatbelt denotes to protection towards something or someone. If the one was wearing the seatbelt, then it means that he needs to be more careful about something, or it already shows the caution the one has in all aspects of his life. To dream that you are struggling to put the seat belt on, shows your inability to confront the problems you have.
Seat Belt dream meaning
Read more about dreaming of Seat Belt in other dream meanings interpretations.