How do you get rid of a defeatist mindest?

Im not sure if this is something that really ever goes away, but I have, in a sense, a defeatist mindset that "prevents me" not meaning taking away my agency of course but it more acutaley "Hinders me" from talking to people or taking any action to lift me out of the situation I am in for example, if I see somone im intrsted ill come up with a laundry list of excuses to not approach them like knowing they wont like me or will hate me, not thinking i deserve to approch them, even if it did suceed id fail and a plethora of other thngs It gets to a point where my freinds litterlay dragged me to talked to people beacause I was to terrfifeid to. Im not sure if this has to do with low self-worth or what.