Why do I keep losing weight and gaining weight?

I used to weigh 146.6 lbs on June 1 next my weight was 146.0lbs on June 4 and on 5 was 145.8lbs. Then my weight was 146.0lbs on June 10 .next my weight was 147.8 on June 15 and on June 22 was 142.2lbs. On July 13 my weight was 141.8lbs and on July 15 I weight 146.4lbs. I am 19 year old girl my high is 4"11 and I am lazy but I do executive exercises when I need to do it. My normal supposed to be 108 and I trying to lose 33.8 pounds but when weigh go up I feel like I should just give up and over weight. I want to keep the loading weight but it difficult when my weights increase and decrease. What can I do that will keep on the right track.. Please answer this questions as soon as possible.

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