Hi pnkmilk, and welcome to Scarleteen.
I think I just answered this question over on our text service but I am happy to post that response here too, since this is an easier place for us to have a more in-depth conversation.
It's hard for us to know from the outside whether you experienced an orgasm or not, but it's certainly possible! Sometimes an orgasm won't feel like a huge release. In terms of when it's over or if you "should" keep going, it's really about what feels good to you! If you felt satisfied or just ready to be done, then stopping is fine (it's always fine to just stop if you want), but there's nothing wrong with continuing to masturbate after an orgasm if it feels good. For some people it's too sensitive, but others might find it feels very enjoyable.
This article about orgasm may be helpful to you: Sexual Response & Orgasm: A Users Guide
and a general search on our site for "orgasm" will turn up a lot of resources and advice columns that may be useful as well.
But overall, it's very common for it to take some time to figure out what feels and works best for you! One thing I do want to mention is that putting pressure on yourself to orgasm, or going into masturbation feeling frustrated or like "I MUST ORGASM!!!" is honestly going to make it much
more difficult to get there. Sometimes it can help to focus more on overall pleasure when masturbating; if pleasure, not orgasm, is your ultimate goal, you may find that it's easier to achieve orgasm eventually.