How to get more confident and motivated to lose weight?

I thought I was getting better. I felt super confident and sexy until my father said I look like a cow since I stopped practicing.
I played volleyball, my team was really toxic and the coach was always bodyshaming me even when I was the perfect weight. I couldn't handle it anymore and I quit, I started hating the sport.
I have a big party in June and I ordered a dress, I thought, God, I'll look fabulous but I guess I won't because I'm just getting fatter that's what my friend and father said. I'm more curvy but I wouldn't say fat, what if I got thicker thighs and ass? I like them.
But their opinions affected me to the point I started to starve for days just to lose some pounds. I got so desperate that I wanted to hang myself but I was too scared to do that so i overdosed with all the pills I could find in the house just to end things already but I just got in more pain.
There's really no more point in living if I can't be beautiful and loved, thats what I think

I'm 5'4 and 136 pounds.
How to get more confident and motivated to lose weight?
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