It is never a red flag. If other people don't like you because your less experienced, aw well. They don't have to date you. Somebody who is more appreciative of you will. I've avoided relationships all my life by choice. Especially the way how others expect me to be in relationships. And that is something I don't need. Never be afraid to be alone, and focus on school because that will make it in your future not girls. So unless your looking to marry young, I wouldn't worry about dating right now. Your fine. And I cheer you on! You date when you know you are ready. Don't rush.
I'm really uncomfortable with being with virgins, not becasue they don't have any experience, but mostly because I think that a person's first time should be something REALLY GOOD, and something to remember! That's a lot of responsibility!! I was with a 28 year old woman, and she was a virgin, and she was so conflicted, wanting to know, but afraid. age had NOTHING to do with it!! People have their life paths, and it isn't always what society expects!! Just relax, and know that you are NORMAL, for YOU!! Don't feel like you need to be anything like 'society' says you need to be!! Take your time, and when you find the right person, it will work out, OK?
If you're a great guy, it won't matter to women you meet and they'll be more inclined to believe you. If you turn out to be some creep with zero social skills then they can see why and won't believe you.