<human>: FYI: English is not my native language - sorry in advance

4 months back I decided to get on a diet, and wanted to make my own, as I have successfully done that in the past. The goal was to lose weight with a strict diet that would allow me to lose about 0.5 kg each week. This would for me, be eating 2000 calories a day. 

I got on this website where you can put in specific foods from specific companies, so you know the calories should be correct. I added and took away a lot of foods before I finally was done. 

In the beginning I was generally pissed off and in a bad mood all the time. I went to bed out of exhaustion around 20:30-21:00 and slept for 10-11 hours every night. I didn't think much of it, and knew it was hard cutting from previous experiences.

In my 2nd month I started to get depressed and preferred to be alone in my room watching movies and playing games after work and gym, also in the weekends.

3 months later I got really depressed, but decided it was worth sticking to the diet because of the end result I was going to get. I was constantly craving food and was tired all the time. When at the gym, I became dizzy after lifting for a few minutes, and at the end of the month I ended up puking in the bathroom at the gym. 

Now, 4 months later, I checked the scale and had lost over 11 kg in 4 months (I should've only lost half the weight by now). I triple-checked to make sure it was right, and it was indeed correct. I go back on the diet website and check my meal-plan. I realize an enormous FU, I forgot to take away 3 WHOLE AVOCADOS, which makes up about 1000 calories. I was basically starving my self without knowing it for almost 4 whole months, but I did lose a lot of weight though. Anyway, I am now back to bulking. 

I know I'm a stupid fuck for not checking earlier, and I always felt something was a little off, but thought I just had to adjust. Still, I'm stupid as hell and will be triple-checking my future diets before starting.

Can you give me the gist of the text in a nutshell?
<bot>: Made my own diet, forgot to remove 3 avocados (1000 cals) without knowing, ended up starving my self with 1000 calories  day for 4 months.