vibrators?

Hello! I'm 17 years old and I really really want a vibrator. I'm curious about starters and if I can actually get one? I've heard you have to be 18 and I think it's a bit embarassing to ask my mother (as she is on the old fashioned side) to help me with this process. My boyfriend, is uncomfortable buying me one and says it makes him feel "incompetent" but we are holding off on anything as he is 18. 
Anyone have any experience with some beginner vibrators? My price range is fairly low (high school student lol), the highest I'd go is maybe $25? Unless that's bad, I really have little to no information. Honestly, I feel like I've never had an orgasm before and I don't even know if I could tell what it feels like.
Many thanks!