Am I ready for a relationship?!

Yeah so I (18M) have been thinking about this a lot lately. I had only one girlfriend for a month this far and I want to get into a ser...

Yeah so I (18M) have been thinking about this a lot lately. I had only one girlfriend for a month this far and I want to get into a serious relationship. The thing is that I'm a bit of an overthinker. I had this situation when a girl didn't answer my text for half a day and my thought kept running and I thought she doesn't want me or maybe she started to talk with someone else etc. When she answered me she said that she fell asleep that's it haha. So if I overthink in those types of situations can I handle a full time relationship in my condition?