I’m really not goobad at networking. I’m really bad at networking.

"Not good" is still OK!

I tried to be an outgoing person, but that totally didn’t suit myselfe. I tried to be an outgoing person, but that totally didn’t suit me.

I tried to be an outgoing person, but that totally didn’'t suit myselfe. I tried to be an outgoing person, but that totally didn't suit me.

I tried to be an outgoing person, but that totally didn’t suit myselfe. I tried to be an outgoing person, but that totally didn’t suit me.

Myself/himself/herself etc. should only be used when the subject is the same person as the object. Here, the subject "that" is referring to "being an outgoing person", while the object is you. Example: I like myself. She made herself a nice dinner.

I tried to be an outgoing person, but that totally didn’t suit myselfe. I tried to be outgoing, but that totally didn’t suit me.

"I tried to be an outgoing person" is still OK, but not saying "person" when using an adjective like this to describe the subject is more natural. (Example: "Tamaki is nice.") Everything that comes after "but" should be treated like a new sentence. Since "I" isn't already the subject in that sentence, "me" should be used instead.

I tried to be an outgoing person, but that totally didn’t suit myselfe. I tried to be an outgoing person, but that totally didn’t suit me.

I tried to be an outgoing person, but that totally didn’it doesn't suit myselfe. I tried to be an outgoing person, but it doesn't suit me.

Additionally, I’ve been using various SNS and posting about my hobbies, but I don’t have relationships with the other people on there. Additionally, I’ve been using various SNS and posting about my hobbies, but I don’t have relationships with the other people on there.

To "have relations" between people could be interpreted to as a euphemistic way to mean having sex. It's better to avoid this phrase to avoid being misinterpreted. "To have a relationship/to have relationships" is what you should use instead.

Additionally, I’ve been using various SNS and posting about my hobbies, but I don’t have relationships with other people on there. Additionally, I’ve been using various SNS and posting about my hobbies, but I don’t have relationships with other people on there.

Additionally, I’ve been using various SNS and posting about my hobbies, but I don’t have relations with other people on there. Additionally, I’ve been using various SNS and posting about my hobbies, but I don’t have relations with other people on there.

SNS is not a common acronym in English speaking countries, it is best to use the full name "Social Networking Services". The grammar is correct, but it may not convey your idea as intended. My suggestion is: Additionally, I’ve been using various social networking services and posting about my hobbies, but I can't really connect with other people there. (note that I also removed the "on" to make it more natural)

Additionally, I’ve been using various SNS and posting about my hobbies, but I don’t have relaany connections with other people on there. Additionally, I’ve been using various SNS and posting about my hobbies, but I don’t have any connections with other people on there.

"any relations" is OK too! This just sounds more natural.

Additionally, I’ve been using various SNS and posting about my hobbies, but I don’t have relaconnections with the other people on there. Additionally, I’ve been using various SNS and posting about my hobbies, but I don’t have connections with the other people there.

Additionally, I’ve been using various SNS and posting about my hobbies, but I don’t have relations with other people on therhaven't connected with anyone. Additionally, I’ve been using various SNS and posting about my hobbies, but I haven't connected with anyone.

I have no idea how Ito make many new friends. I have no idea how to make any new friends.

OR: "I have no idea how I should make new friends." OR: "I have no idea how I am going to make new friends."

I have no idea how Ito make my new friends. I have no idea how to make new friends.

I have no idea how I can make mynew friends. (or I have no idea how to make new friends.) I have no idea how I can make new friends. (or I have no idea how to make new friends.)

I have no idea how Ito make my new friends. I have no idea how to make new friends.

Since you do not have new friends yet, you do not use "my". "to" is used when talking about an action or verb. (Example: "I'm going to eat this.") "to" can also be used to talk about a location (Example: "I'm going to the store.")

I have no idea how Ito make my new friends. I have no idea how to make new friends.