I don´t think it's serious. You could visit a professional to check it out for your peace of mind. I think your main problem is your anxiety. You are not at risk. The previous comment is right you should not be having sex you are too young. You are safe. Have a nice day.
No need to worry. Could be many other things. Make an appointment with a dermatologist asap. You are still young enough to get the HPV vaccine if you wish. If necessary, ask your doctor for a blood test that can detect other STDs like herpes, HIV, etc. At age 14 - either you should not be having sex because you're immature or you should ALWAYS play safe with condoms. And please limit the number of partners as you age. This isn't a contest for the most partners. Being monogamous has its advantages like not getting STDs!