I think the thing many people don't realize about crystals is that using them is not like taking a pill. You may read about all the benefits of a certain crystal, decide it's the one for you, keep it on you all the time, and cleanse it regularly but that does not mean you are going to feel its effects.
These stones are a consciousness, and they are here to help us, but it is you who is doing the magic. Crystals can help you to raise your frequency in a certain way, but they require you to work with them, and connect with them, before you can assimilate their energy.
Think of crystals less like a prescription you pick up at the pharmacy and more like a wise friend who will stick with you through the years. While the prescription may have instant results, it is the wise friend who will guide you through the years and have the much bigger impact. Like with any friend, there will be a period of getting to know each other, of sussing each other out before you have the courage to be yourself completely. This is very much a mutual thing, but when you are both ready, the results will be tangible.
Everyone can feel crystal energy, but for most of us it first takes a lot of work. Eating healthy (cutting out meat, dairy, and processed foods) is one of the biggest things you can do. Stop drinking and using products with sodium fluoride. Meditate, as much as you can. If you meditate regularly and then incorporate crystals into your meditation, you will definitely feel their energy over time. I like to place them on my third eye during meditation and this is when I feel their energy the strongest.
It's easy to read a description of a crystal and be enthusiastic about owning it, but in order to foster a mutually beneficial relationship with crystals you have to realize its more of a friendship than anything else. I hope this helps in some way.