Masturbation....(obvss) ANY TIPS

I'm 14 and I found a little vibrator in my mams room about a year ago. It was still in the box and packaging etc. The box was a little dusty and looked like it had been there for a while and she had forgot about it. Any ways, I've been using it since I was about 14 and I use it most days. But I never really know if I'm climaxing. 
I see a lot of posts on here saying that it's the best thing and they kind of forget about everything and spots and everything. I'm aware of everything. My legs don't shake I don't feel any different. I don't really know. I just really want some tips. I'm getting really stressed at school and just want something to take my mind off it but can't get a good enough climax to distract even for 5 minutes. I don't last long either 😞😞😞😞 help me please