How do I stop my shaking or twitching? Is it a problem I should worry about?

So the main problem I’ve been having lately is that I’ve been having twitching or shaking issues all through out my body….It’s mainly when people maybe lie on me, or rest their head on my shoulder or something related to that (if you can sorta picture that) I don’t know what to do about it! It’s when ever they do that I sorta feel a weird twitch or something….But I don’t know what to do about…I have no idea if this is gonna be a huge problem when I grow up or if it’s just a problem I can’t control….I want to stop it. How do I? And also is this a bad thing for me? (I wonder if my ‘girlfriend’ ever wonders why when she’s lying on me or something….)