Unfortunately I think this male-avoidance programme is spilling out to the point where I want to feel as unattractive as possible – which isn't good for the ol' self esteem..
Oh dear…
Thing is, all men are bastards. It's just that some are bigger bastards than others. Unfortunately.
You mention being a student. A difficult time, for sure. Many people are trying to establish their own identity, and this can be a difficult process, as you are constantly under scrutiny from you peers (or so it seems). Many young people suffer from low self esteem in this sort of situation, and it's not uncommon for individuals to suffer crises of confidence. Not helped if relationships go sour; one minute you're riding the crest of a wave, everything seems perfect, the next, it all comes crashing down. People can be very fickle, in such a rarified environment. I saw male friends boasting about 'conquests', but the reality was that they actually felt very lonely. Surrounded by others, expected to be having a great time all the time, that's a lot of pressure.
Seems like you might be feeling a bit raw and vulnerable right now, and feel that you need to be defensive. That's natural. But ultimately, you're still the person your friends love you for, that hasn't changed. Concentrate on the positive; try not to let the negative corrode the good person inside.
Solitude is good. But let it be your time. Fill it with things that nurture you.
Don't sit in your bed all day; you've got a bike! 😀