Hi, I'm a female,15 yrs old. I have social anxiety, could be marked as severe. I'm looking for a part-time job that deals with little customers. Fast-food restaurants are a nono for me. I also want to be independent by now. However, I do well with children, and been thinking of babysitting. But I don't want to get myself in any type of motives a person has. 

You are 15 years old. It's pretty doubtful that you're going to find an actual job in the workforce until you're older, so you're going to have to find other things to do.

Mowing lawns doesn't require a lot of social interaction. Babysitting will require you speaking to the parents on a regular basis; you'll be also entertaining the child(ren) on a regular basis so don't forget that aspect of it.

Know this about social anxiety - the more you practice speaking and making eye contact with people, the easier it will become. Instead of dropping your head down to text someone, actually go over and speak to them in person. Make eye contact and smile to convey that you are listening to who is talking.