Orgasm

So I use my little muscles gun that I got for working out as a “toy” I definitely get a good feeling and I get to this point where I think I’m having and orgasm but not I just get this really good feeling for like 2 seconds and then it stops and I get so so so sensitive on my clit and if I try to touch it with the gun again and try to orgasm I just close my legs but I don’t want to but I do lol. How can I get my self to the point where I actually orgasm and don’t get to sensitive down ther?