How do I get through life with my biggest fear and problem?

I got a speech impediment, which dont allow me to pronoun barly any word correct, its make it difficult for peoples to understand me. I feel like ill never get thru life or do anything wonderful because of this. I had a few job interview, and i found it very hard to make it thru the whole thing, I was surprised that the managers didnt even asked me about my problem or even mention it. I didnt tell them tho, but see i cant go to interview, if i do i have to choose my word very i mean very careful which. Well i have to do that every time i talk to peoples i speak some words better then other, so i have to choose them wisely. I wanted to go to college but i dont know how i would do that, i wanted to get my GED, stuff like that is shatter because i cant talk right but yet im smart and stuff but that problem overshadow every good trait i have. I was lucky enough to get a girlfriend who help me with stuff like doctor appointments and everything. Still she wont be there forever, and im afraid when she leave if she do ill be trap in a hole and never be able to find my way out.

I just need some tips or anything, to help me learn how to get thru life and problems and like get a job without its being to difficult…i had a crazy idea but i dont know if i could go thru with that.. is like when i go to a interview i lets them know about my impairment, but i doubt i got enough pride and courage to do that. Then for things like appoints i get a state ID and bring it with me at all time to lets them know my name, DOB, stuff like that so i wont have to talk.

but i still dont know … help?

p.s i cant do anymore speech training class i reached the max they said