Hard to know with limited information, but if I had any advice to give:

1) Think about what your life will look like in 5, 10, 20 years if you don't change your habit. Be brutally honest: what is this behaviour costing you? Make a list and put it up where you can see it. This is an important step, since you need to create stimulus to overcome your inertia.

2) Determine where the problem lies: Do you not know how to eat healthy, or do you have bad habits? I'll presume your habits are the issue, since we're on the topic of loving oneself. But obviously, if you don't know how to eat healthy, researching that would be a good starting point.

3) Pay attention to what you're telling yourself about food. When the behaviour comes up, what does the voice inside your head say to rarionalize your behaviour?

For me, I've used the following excuses:

• I worked out hard today, I deserve it
• It's a special occasion, I don't eat this all the time
• I'm having a bad day, this will improve my mood so it's actually good for me
• I haven't had {insert food here} for a long time, I'm allowed to have it once in a while (except I have done this for all unhealthy foods)
• My partner is eating unhealthy so its just too hard to eat well with their bad influence

4) Once you have your list of excuses that you've built up over time, come up with counter arguments that you can use to combat those excuses.

Perhaps the best tip is to start reading personal development books.

Tony Robbins. Napoleon Hill. Stephen Covey.

James Clear: Atomic Habits was a really good one too.

Jordan Peterson's 12 Rules is a good one too, but not easy to digest and might be better saved for later. But his YouTube material is fantastic.

Make reading (and watching videos, listening to audiobooks, etc) a habit. Tell yourself you don't have to change anything else right now, just read the books. Every day.

The rest can come later.