How do you overcome the fear of losing people and ending up alone?

I recently realised I've made all of the most important choices in life, based on other peoples wishes. I never stoof up for what i wanted and regret it now. I am/was always afraid of having a conflict with people, being dumped by them and to end up all alone.

I want to be able to stand up for myself without stressing over these things. Any tips on how to overcome these fears?

How do you overcome the fear of losing people and ending up alone?
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