My Powers Continue To Come And Go

I have been having an internal turmoil with myself and my "abilities" as of lately... Now, I have always tried my hardest to believe in magic and the supernatural and I am a out of practice Wiccan. However, I have zero to no idea how to control anything I have or manifested over the years! I have had a plethora of clairvoyant moments growing up such as guessing when things are going to happen or knowing where something is without any previous knowledge on its location. Also, when I would flip a coin I would be able to guess if said coin were heads or tails and I wouldn't always be right but 50% of the time I am. Not to mention my empathic abilities in which I would be able to feel my friends emotions and start acting the same way and that sometimes is annoying... But my main issue is these powers I have don't always work! I don't know how to use them on command and it makes me loose belief sometimes that I have them at all and that maybe all those times I was right were just simple coincidences. It was last year that I went to a witchcraft shop that opened up in the town I lived in at the time it was called "Magical Pathways" and in the store worked a high priestess who was one of the nicest people I have ever met! One day after school I decided to stop at the store and study there because the energy there was so relaxing. On that day my hand was hurting tremendously so I asked her what I could do at home to make it feel better. However, after I told her how my hand started hurting she held in and my pain went away when she let it go and told me what was wrong with it and that I had torn the muscle in my hand and to put heat on it to the the pain away if it were to return, even though it didn't for a couple days. She was going to teach me magic and things like that but at the time I was 17 and she, being responsible, said I needed parental guidance but I knew my grandmother wasn't going to allow me to do anything of the sort being a "devout Christian" or as I like to call it a "devout drinker". Moving forward, I thought that the reason they weren't working up to snuff was because I wasn't 18 yet and that my abilities were bound bc I wasn't old enough. My birthday was yesterday and I still feel no different from last year! I tried some of the tests on here and they all said I was psychic but earlier today I was able to guess the coin flip correctly each time I flipped it but I stopped in fear I would get it wrong thus justifying my fear of losing my clairvoyance or whatever I had. Growing up I was always able to notice coincidences in everything and everyone but I no longer can and it bothers me to think that someone could have or did take my abilities from me and rendered me mundane. I hope that someone can help me with my conundrum and maybe teach me how to master these abilities!