Is it normal to be a virgin at 18 and never had a bf?

That's putting an overly negative spin on it to say that there's something wrong with you.

I'd say that you've been very sensible up till now to not get involved with sex.

Assuming you have no strong religious views on the matter, when you leave home is a great time to embark on your sexual career.
It's the jump from childhood living conditions to adult that makes it such a great time to start having sexual partners.

There will be development opportunity for you now. One where you develop the inner you. Your core life philosophy. Your attitude to yourself and your life. One where you let go of a lot of the inner emotional baggage and restrictions you've been placing on yourself. One where you become less self limiting. Less self defeating and less self destructive. One where you mature nicely as person.
With this inner change in you going alongside you finding out about and developing practical skills. With social skills being an area you should focus on.

You should also look at getting some food shopping and cooking skills. Find out about good nutrition. Anti-oxidants vs inflammatory foods. And make it a core part of what you are to fuel yourself with anti-oxidant foods. As well as certain foods that are rich in important nutrients.

So that you're trying a 2 pronged solution to you feeling low. Psychological and your body's internal chemical balance.

Being the same as just about everybody else is OK. But it's about just as easy, maybe easier, to be different to most people. And that's what you should be aiming at. To be different to most people in the right kinds of ways. Do that and you will have an amazing life. With amazing adventures, including sexual adventures.