R sound Help?

Hi Im 13 years old and i cant pronounce the r sound. For example right sounds like white Corner sounds like Co then a VERY DULL R SOUND then ne i cant even say words like poor or soar it sounds like poe and soe :( iono its really sad but english wuz my 1st language and i still can do it lots of people make fun of me and it gets to me It wud be very helpful if u can explain where to put ur tongue and lips and pictures will be absolutely awsome! I dont want to go to speed therapy cuz i wud get pulled out of cl every week and i wud go under the "speical ed" file and even more people will make fun of me....ok Well thx >:D and have a great week