Hi @Jay131 - yes this definitely sounds like the moment before squirting! It takes a lot to relax enough and trust yourself to let it happen.
I’d recommend going for a wee beforehand which will help you psychologically - then try and just let go and let it happen. The tricky thing with squirting is that the more you think about it the less likely it is to happen, so it needs to be a no pressure type situation!
There’s some really helpful threads about squirting on here too so give those a read too 
Jess from Lovehoney did a really good post a while ago about the differences between squirting/ejaculation and orgasm!