Am I a Mind reader? see description below.......?

Ok, So sometimes my friends wouyld tell me something very descriptave and convincing such as 'OMG this shirt was like 90 dollars but i just HAD to have it!' and then a really weird thing happends, a fuzzy voice (sounding alot like theirs) says 'Theyll think im so cool and rich :D i got this for only 20 bucks! thell never no! haha!' this has happend more then twice maybe 4 times and its becomeing more frequent i talked to my mom about it and she told me to read her mind but i cant do it on demand, lots of ppl think im a liar or an attention-seeker but this is really happening and im scared towards it, what if i am crazy? or what if i am a mind reader? How can i tell if my readings are true, and not just my imagination?