Help! Can’t finish...?

Hello ladies! I have never finished... ever 😓 I’m a virgin saving myself for marriage but trying out masturbation, I can always get myself tingly and breathing faster but then it just sort of... dies away? No matter what I do to try to keep it, running faster, deeper, etc. I’m always disappointed and feel like I’m really missing out on something. It’s supper hard to get myself to the tingly stage too, need visual+ sensory info for like 30 min before I start to get aroused. Help! Am I doing it wrong? Any suggestions? I am just using my fingers, will not use sex toys. The real thing will go in me before plastic will, haha. I thought fingers could work too tho...?