I have always wanted to make an anime, so I started to make itone because I have time.

First, I made a storyboard and a video connected theming it.

"video connected" sounds to me like a verb. I'm assuming you're talking about a video you made to connect the storyboard, not the process of connecting them with a video. If you mean the process, you could say: "First, I made a storyboard and connected it with a video."

"It" instead of "them" because you're talking about a storyboard, which is singular (even though it's made of multiple part).

I'm worry that Iied about makeing it by myself.

"I worry" and "I'm worried" are pretty much the same, but "I'm worried" is used more often.

"I'm worried that _______" in English indicates a possibility of something negative happening. For example, "I'm worried that I won't be there on time" means I may or may not be on time, and that possibility causes me discomfort. However, we don't say "I'm worried that I will be there on time". We do say "I'm worried about being there on time" to indicate the possibility of something negative or positive happening. Also, notice that the verb after "I'm worried about" is always in the -ing form. Because "making it by myself" is not a negative statement, "I'm worried that_____" can't be used.

I have always wanted to make an anime, so I started to make it because I have time.

First, I made a storyboard and video connected them.

This sentence may be OK. I am not sure.

Surprisingly, the number of shots areis more than 70.