Is it normal that i don't get strong orgasms anymore?

I am a 24 year old guy, and I've been masturbating since the age of twelve. When I first started masturbating, orgasms felt amazing, I could feel pulses through my legs, and my penis, and it felt amazing. However, around 10 years later, this changed. I would masturbate frequently and eventually, orgasms did not feel as good. Now, the feeling of an orgasm is very small, and I cannot feel it in many areas, just my penis in fact. Following my orgasm I feel bad for masturbating and immediately get flaccid. I also find it hard to get aroused for for the next 10-20 minutes. Is this how orgasms are supposed to feel like? How can I bring the intense feeling back?