Thank you for your responses everybody.
Just an update: I didn't actually implant false memories, but I have altered a great deal of my past memories, especially embarrassing ones. I did this by a process similar to the
swish pattern in NLP.
I would think of a past embarrassing memory and imagine it taking place. Then, I would replace it with a more desirable memory. Now, if my brain ever starts to bring up that embarrassing memory, it brings up the pleasurable experience I implanted instead.
However, I found an even more useful method: being in the present moment. Usually I try to remain focused on the present moment, so there's no reason for me to think about my past.