I cant spell no good at grammar don't know what else to do?

hi i am 34 single dad of 2 i can't spell no good with grammar here my story i was in special ed as a kids i did not know how to read till i was 16 i taut my self to read using auto repair books dirty magazines any way i am a very good at reader and reading comprehension now any ways you can see i can not build a sentience right i can't spell some so bad spell check don't work i have tried getting help form the county and local collage just tired of feeling stupid and afraid that my kids think that to what can i do if you are wounding i did graduate from high school some how even thow i had teacher tell me point blank i would not make it my guydents consular even said i was to stupid for college to my face what else can i do tired of a up hill fight even my math is no good