Could Twitching In Legs And Arms Be Due To ALS?

Hey. I m an 18 year old male. I recently went to the doc just for a check up. They ran what they called an broad range of tests, including blood. Everything came back completly normal, including my Vit D, which is kinda rare they said. I have been lifting wights lately, and have noticed that I twitch some in my legs and arms. I made the mistake of going online and asking Dr. Google why I was twitching, and of course the first thing I got was ALS. Now, I realize this is really dumb, but GOSH, it really frighted me. I have become very depressed, and though I know I don t have it, and probably never will have it, whenever I get the slightest twitch or pain, I think I won t see my 30th bday. Now I read up on it, namely ALS, and read it occurs mostly in people over 50 and there is a link to the military. I have had both grand dads go through the military, and neither got the disease. I know I must sound dumb, but I m really in a funk. Somehow, accepting my good health, which is a blessing, is hard for me. I have a few Q s. One, how do I get over this fear. 2. Do you think ALS will be cured within this decade. I m going to Texas State, and will either do physical therapy or micro biology. 3. What are the odds of me getting the disease over my lifespan. Thanks!