My heart has this weird beat to it; could it be atrial fibrillation?

Wierd beat: To know what your heart rhythm is you need an ECG and perhaps a holter monitor if nothing is present on the ecg. This can show your abnormal rhythm and identify it.

Sure - why not: At your age, atrial fib would be a bit unlikely, but yes, it could certainly be a culprit. The other respondant is correct in stating that we need to capture this on an ekg or a wearable monitor to correctly identify its nature. There should be a good electrophysiologist in galveston if you want to investigate further.