Need support for a new beginning

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Hello everyone!!!

Since the start of this year (7 months ago) I promised myself I was going to lose 30 pounds. I have been consumed by this thought ever since but I can't stay away from my yo-yo dieting and excerCise ecause I easily get thrown off track and lose motivation because it seems as If nothing works. So far I've only lost 10 pounds, which came off all in the months of April but I have maintained my weight since then!! I'm looking for support, I really need and would appreciate it!! I'm determined this time around :)
any tips?!?! Thanks guys happy weight loss :)

I'm
Height: 5'3"
Starting weight: 142 lbs
Current weight: 131 lbs
Goal weight: 115 lbs