Where do you live. I am a firm believer that MMA should not be the first combat sport one participates in. At 21 it's too late for wrestling, but boxing, MT, BJJ are options. Have you looked for options outside your immediate radius?
I'm in Mossel Bay, South Africa. The thing is that I'm very limited to my option. The closest city is Cape Town, which I'm sure have many gyms for all fighting style, but im like 170miles from Cape Town. Whats nice about our gym is that we have 3 trainers. One focus on stand up, especially kick boxing and MT. The other 2 focus on grappling, takedowns, ground and pound and submission.