The /r/ sound, as we say it in English, is really like no other! Many languages do have some version of the /r/, but in these languages, speakers say it quite differently from English speakers. In most languages, the /r/ is a true consonant, with some noisy contact made with the tongue and another part of the mouth. In Spanish and Italian, it is the tongue tip vibrating on the gum just behind the upper teeth. In French and Hebrew, it’s the back of the tongue touching (or almost touching) the soft palate (the back part of the roof of your mouth.)
Here is the secret to mastering /r/ in English. In English, the /r/ is much more like a vowel. You should not feel any contact of the tongue with top of your mouth.
If the English /r/ is a difficult sound for you to pronounce, try first mastering this sound in words where it is a simple vowel. Even though the spellings are different, the ir, ur, and er of sir, fur, and her are all pronounced with the same /r/ vowel. Next, you might want to practice the /r/ sound when it is combined with another vowel, as in fear, door, hour, and far. Then, learn to shape this sound into the /r/ at the beginning of a word or syllable (rain, Rome, arrive). Finally, learn to pronounce the /r/ when it is combined with another consonant, in words like friend, present, great, and train.
If correct pronunciation of /r/ is a problem for you, you may need English pronunciation training. It is one of the most difficult sounds to learn! You can get training to master this sound in an accent reduction program like those at Confident Speech.