struggling with self Worth

So I am an adult. age 25. after completing bachelors I did 5 months of teaching at school. After that I got into an accident and my I got fracture. During recovery I realized that I did BS-IT I should go for that as it is my education. After doing only 2 interviews I got a job they said they are giving me a chance but I was not properly trained as it was a remote job and after some time I got laid off saying I was not good enough. And I Know that my Skill set is not up to the mark as well. Now I recently got an internship. Company said we will train you for 4 months and every person who comes here get well trained for corporate world. As I got this internship on reference I am having really negative thoughts. Like ,everyone learned in 4 months will I be able to learn too or will get laid off like before. I am an introvert and even though I can communicate in English in written forum it's difficult to do in person as this company culture is I have to speak in English because it is American based company residing in our country (I am not a native speaker of English). I know I lack in so many things but if I look back at my life when I got a good environment I did well. but life is not like that you will not get good environment everytime. It just I don't know what to do as I can't afford a therapist or phycologist or any other professional.