How can I FORCE myself to start conversations?

I try often to start conversations with others, but often psych myself out. If there is a person in my class I want to talk to, I just can’t. Even if I make it my goal to talk to that person and try to prepare for it thinking of things to say I just can’t. Also, trying to just not think about it too much and then wing it doesn’t work either. When I am the moment I just cannot force myself to do it. I just shut down. Its a very strong mental block. I’ve tried looking for tips online and so far nothing has really worked.

Funnily enough, if it is just something that is direct and spontaneous I am fine doing it. (Something like I don’t know where a building is – I can ask some random person walking for directions just fine) Idk if anyone else has the same thing, but I wonder if there is some other advice then “just do it” or “don’t overthink it”