How do I stop being scared and stop pushing people away?

I end up getting so scared of love and attachment, if someone comes on strong or is too fast, I'll say im terrible/talk down about myself or push them away. What do I do? I don't really want to do this deep down. I really do want to be seen, understood, and loved by somebody. I just knee jerk react. 😿 I'm not sure where to start.
How do I stop being scared and stop pushing people away?
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