First Conditional or Second Conditional
Generally speaking, if you want to talk about something which is likely to happen, use the First Conditional; if the idea is unlikely, use the Second Conditional.
Obviously sometimes we can use either of these types.
The first example suggests that I think I work too much and I ought to stop; the second example suggests I don’t want to work too hard and this is why not.
Using the first or second conditional depends on the point of view of the speaker:
The First Conditional uses the present tense and the second conditional uses the past tense, but both of these conditionals can talk about the present or future – the tense does not show time but likelihood.