I'm 13 years old and have mildly sever anxiety and looking for advice.

I haven't really told my mother because she just tells me to deal with it whenever I have an anxiety attack. I tend to feel that if something went wrong, it was my fault. I don't think that my mother has ever dealt with bad stress before, but I know my father did when his brother died. In fifth grade, I was going to attempt suicide but my friend talked some sense into me right before I was about to. I've never really felt okay in my body, not like I want to be transgender or anything, I've just always felt really ugly.

I can completely understand your feelings. I am now 22 and while those feelings are still exist, they are way milder than before.
I am grateful that your friend talked to you and helped you to deal with the situation. I hope you can still find that sort of comfort with them.
You’re still very young and going through a shift of mindset from child to teenager. That comes with a lot of complications. The feeling that you might be ugly is often normal and as long as it doesn’t prevent you from going through daily life, it is fairly harmless. It’s good that you’re searching for help and not ignoring your symptoms though.
Could you talk to your father or to a teacher at school? Are there any free resources from teenagers in your area you could get help from? Please don’t think that I don’t take you serious, because I do but I know from personal experience that negative feelings about your body tend to be normal during puberty. But attempting suicide isn’t. I sadly can’t offer anything else than my support and my open ear, so if you want to talk in private, you’re always allowed to message me.

Hello ImTryingMyBestOkay: It appears this is your first post here on PC. So... welcome to Psych Central. Thanks for sharing your concern here on PC.

It is really important to share how you're feeling with someone... perhaps your father since he has had some experience with bad stress himself. You mentioned having contemplated suicide & always feeling really ugly as well as having anxiety attacks. These are all things that need attention in some way or other. Posting here on PC can help. But, ultimately, talking with someone in real life about what is going on with you is likely to be of the most help. So I hope you can find a way to do that.

Here's a link to an article, from Psych Central's archives, that offers tips for coping with emotions as a teen plus links to 2 articles that offer suggestions for how to stop panic attacks:

Techniques for Teens: How to Cope with Your Emotions

Everything You Need to Know About Panic Attacks and How to Stop Them

Stop a Panic Attack With Emotional Freedom Techniques (EFT)

I hope you find PC to be of benefit.

I am so sorry you are going through this and that you are not getting support from you mother. Please don't bottle up your feelings. Keep expressing them and try to find a trusted adult that you can talk to. or at least a friend.