Is that family member your significant other? Because what you are describing is emotional abuse and isn't ok. Bringing junk food in the house is fine. That is your issue, not theirs, so they should be allowed to bring whatever food they want to eat into the house and it is up to you not to eat it. But making fun of you for trying to get healthy is totally not ok. If it is your significant other, you need to tell them that it is hurtful and you don't appreciate their abuse. If they continue, then you should consider whether that is a relationship you want to keep in your life. Toxic relationships are not healthy for your well-being.
As for the rest, I found that, at least at the beginning of my journey, at a higher weight, it was enough to cut back on the junk I was eating. Didn't even have to cut it out entirely. Just have 1 cookie instead of 5, or one less piece of pizza than I usually would have, or a handful of chips instead of half the bag. As time went by, I found myself eating less and less of it. I now have a small square of chocolate (about the size of a kiss) once or twice a day, but not much else for sweets, and not much at all for salty foods. I'll occasionally have a few corn chips, but not often, maybe once or twice a month. But it took me months to get to that point. I used to eat 3 small tacos whenever we'd make them. Gradually, I started only eating 2. Last night, I had 2 and felt stuffed afterward, so I may cut back to just 1 or 1.5 now. In other words, I haven't made huge changes all at once. I've made many small ones, over a longer period of time. And the only exercise I've done is walking, but I do it almost every day, for at least 2 miles. But I worked up to that as well. When I started, one mile was more difficult than I had hoped.
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