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Sorry, I meant in my opinion.
Presentism works for me, makes me happier. If Eternalism works for you that's great, we are all different so no one size fits all. When I was studying Physics I inherently used to think like that but I realised my anxieties were all attached to regret and despair about past and future respectively. When I began to think like a Presentist, most of my worries just disappeared.
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I don't think it's necessary to say 'the past and future don't exist', when all that this really means is 'they are not the present'. Of course they exist, in the specific ways in which the past and future exist: the past as the cause of the present and the future as its effect. Both are modes of existence that don't require presence. Moreover, regret and despair are, of course, not the only feelings that can be evoked by either, and many much more positive feelings can be, as well. Denying the past and future because of worries about certain, perhaps prevalent, feelings is like throwing the baby out with the bathwater.
The past certainly does exist and what I have learnt from the past is that so does the future.