Orgasm help?

Allie

Okay so I'm a little embarrassed (even though there's nothing to be ashamed about). I've started masurbating at the beginning of this year, and I can't seem to orgasm (via clit). I get pretty close, and then it's like my body just gives up before I'm ready? Like I know the key here is to just not stop, but it's like my body gets excited or something and then just, stops. It's weird, and I'm not sure how to help myself out.