Peeing everytime when penetrated

I’m a 19F, never had actual sex before, but I do have a long distance boyfriend atm and also my little selection of toys.

Here’s my problem. Everytime I use my dildo (15cm), it makes me want to pee. I tried searching up stuff and most of the articles said to just let go and let the feeling come – since it is apparently supposed to be squirting. So I did that. Not once, but few more times. But everytime, it was just pee, even if I went to bathroom right before playing. I’ve had my fair share of clitoral orgasms, and I’m aware these two are different, but I definitelly don’t think this is how vaginal orgasm should look like.

So I’m asking – is there any way to train my body for this not to happen, do I have to hold back everytime or is it different with an actual penis and partner penetrating you? I’m really looking for an answer, because we are of course planning to meet up with my boyfriend and I want us both to have a great pleasurable time, not me worrying and holding back from a possible orgasm.