Just can’t get there

Hi - I’m 27 & new to masturbation. I have a bullet vibrator and within the first few minutes of using it I have a pretty intense feeling and my abdominal muscles contracting and shaking, but I have to stop because it’s like tickles or something but I can’t keep going. If I pull back and try to go back I kind of lose the sensation. I tried to keep going for like 10 more minutes and sometimes it felt good but nothing that made me think I was close. Advice?