You've been warned: do not, we repeat, DO NOT attempt to loop back on yourself.
Seriously, don't do it. It's just not done. Your future self will be all, 'I told you so.'
Instead, try to avoid paradoxes altogether. They're just so... paradoxical.
For more tips on time traveling, see our Etiquette Guide or our Paradox Prevention guide.
And remember: time travel is all about respect for the timeline, not about being a jerk.